1521655056 has 120 divisors (see below), whose sum is σ = 4420490880. Its totient is φ = 488049408.

The previous prime is 1521655049. The next prime is 1521655063. The reversal of 1521655056 is 6505561251.

1521655056 is a `hidden beast` number, since 1 + 52 + 1 + 6 + 550 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (1521655049) and next prime (1521655063).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1521655056.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1933095 + ... + 1933881.

It is an arithmetic number, because the mean of its divisors is an integer number (36837424).

Almost surely, 2^1521655056 is an apocalyptic number.

1521655056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1521655056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2210245440).

1521655056 is an abundant number, since it is smaller than the sum of its proper divisors (2898835824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1521655056 is a wasteful number, since it uses less digits than its factorization.

1521655056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 1521655056 is about 39008.3972498230. The cubic root of 1521655056 is about 1150.1965778638.

The spelling of 1521655056 in words is "one billion, five hundred twenty-one million, six hundred fifty-five thousand, fifty-six".