1655564001 has 32 divisors (see below), whose sum is σ = 2790267648. Its totient is φ = 849657600.

The previous prime is 1655563981. The next prime is 1655564003. The reversal of 1655564001 is 1004655561.

It is not a de Polignac number, because 1655564001 - 2²⁷ = 1521346273 is a prime.

It is a super-2 number, since 2×1655564001² = 5481784322814256002, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1655564003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71850 + ... + 92051.

It is an arithmetic number, because the mean of its divisors is an integer number (87195864).

Almost surely, 2^1655564001 is an apocalyptic number.

It is an amenable number.

1655564001 is a deficient number, since it is larger than the sum of its proper divisors (1134703647).

1655564001 is a wasteful number, since it uses less digits than its factorization.

1655564001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163961.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1655564001 is about 40688.6225006451. The cubic root of 1655564001 is about 1182.9925005485.

The spelling of 1655564001 in words is "one billion, six hundred fifty-five million, five hundred sixty-four thousand, one".