1655720256 has 56 divisors (see below), whose sum is σ = 4394163424. Its totient is φ = 550218240.

The previous prime is 1655720243. The next prime is 1655720263. The reversal of 1655720256 is 6520275561.

It is a super-2 number, since 2×1655720256² = 5482819132257411072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50526 + ... + 76578.

It is an arithmetic number, because the mean of its divisors is an integer number (78467204).

Almost surely, 2^1655720256 is an apocalyptic number.

1655720256 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 1655720256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2197081712).

1655720256 is an abundant number, since it is smaller than the sum of its proper divisors (2738443168).

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

1655720256 is a wasteful number, since it uses less digits than its factorization.

1655720256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26399 (or 26389 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The square root of 1655720256 is about 40690.5425866994. The cubic root of 1655720256 is about 1183.0297170052.

The spelling of 1655720256 in words is "one billion, six hundred fifty-five million, seven hundred twenty thousand, two hundred fifty-six".