2001556265464 has 32 divisors (see below), whose sum is σ = 4427405568000. Its totient is φ = 830138542560.

The previous prime is 2001556265383. The next prime is 2001556265477. The reversal of 2001556265464 is 4645626551002.

It is a super-3 number, since 3×2001556265464³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576483364 + ... + 576486835.

It is an arithmetic number, because the mean of its divisors is an integer number (138356424000).

Almost surely, 2^{2001556265464} is an apocalyptic number.

It is an amenable number.

2001556265464 is an abundant number, since it is smaller than the sum of its proper divisors (2425849302536).

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

2001556265464 is a wasteful number, since it uses less digits than its factorization.

2001556265464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152970243 (or 1152970239 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 2001556265464 in words is "two trillion, one billion, five hundred fifty-six million, two hundred sixty-five thousand, four hundred sixty-four".