1641000025656 has 40 divisors (see below), whose sum is σ = 4596319518120. Its totient is φ = 547000008336.

The previous prime is 1641000025529. The next prime is 1641000025727. The reversal of 1641000025656 is 6565200001461.

1641000025656 is a `hidden beast` number, since 1 + 641 + 0 + 0 + 0 + 0 + 2 + 5 + 6 + 5 + 6 = 666.

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 1641000025656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1266203076 + ... + 1266204371.

It is an arithmetic number, because the mean of its divisors is an integer number (114907987953).

Almost surely, 2^{1641000025656} is an apocalyptic number.

It is an amenable number.

1641000025656 is an abundant number, since it is smaller than the sum of its proper divisors (2955319492464).

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

1641000025656 is a wasteful number, since it uses less digits than its factorization.

1641000025656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532407465 (or 2532407452 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 1641000025656 in words is "one trillion, six hundred forty-one billion, twenty-five thousand, six hundred fifty-six".