1616536620 has 72 divisors (see below), whose sum is σ = 4932948384. Its totient is φ = 428487168.

The previous prime is 1616536609. The next prime is 1616536627. The reversal of 1616536620 is 266356161.

1616536620 is a `hidden beast` number, since 1 + 61 + 6 + 536 + 62 + 0 = 666.

It is a super-2 number, since 2×1616536620² = 5226381287602048800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1616536627) 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, 3172 + ... + 56948.

It is an arithmetic number, because the mean of its divisors is an integer number (68513172).

Almost surely, 2^1616536620 is an apocalyptic number.

1616536620 is a gapful number since it is divisible by the number (10) 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 1616536620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2466474192).

1616536620 is an abundant number, since it is smaller than the sum of its proper divisors (3316411764).

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

1616536620 is a wasteful number, since it uses less digits than its factorization.

1616536620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53959 (or 53954 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 1616536620 is about 40206.1763911964. The cubic root of 1616536620 is about 1173.6227399990.

The spelling of 1616536620 in words is "one billion, six hundred sixteen million, five hundred thirty-six thousand, six hundred twenty".