1521565056 has 192 divisors, whose sum is σ = 4811788800. Its totient is φ = 457681920.

The previous prime is 1521565051. The next prime is 1521565103. The reversal of 1521565056 is 6505651251.

It is a tau number, because it is divible by the number of its divisors (192).

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 1521565056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521565051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2115865 + ... + 2116583.

It is an arithmetic number, because the mean of its divisors is an integer number (25061400).

Almost surely, 2^1521565056 is an apocalyptic number.

1521565056 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 1521565056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2405894400).

1521565056 is an abundant number, since it is smaller than the sum of its proper divisors (3290223744).

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

1521565056 is a wasteful number, since it uses less digits than its factorization.

1521565056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 902 counting only the distinct ones).

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

The square root of 1521565056 is about 39007.2436349968. The cubic root of 1521565056 is about 1150.1739008599.

The spelling of 1521565056 in words is "one billion, five hundred twenty-one million, five hundred sixty-five thousand, fifty-six".