1801045656 has 24 divisors (see below), whose sum is σ = 4877832180. Its totient is φ = 600348528.

The previous prime is 1801045643. The next prime is 1801045661. The reversal of 1801045656 is 6565401081.

1801045656 is a `hidden beast` number, since 1 + 80 + 10 + 4 + 565 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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 1801045656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12507190 + ... + 12507333.

Almost surely, 2^1801045656 is an apocalyptic number.

It is an amenable number.

1801045656 is an abundant number, since it is smaller than the sum of its proper divisors (3076786524).

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

1801045656 is a wasteful number, since it uses less digits than its factorization.

1801045656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25014535 (or 25014528 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1801045656 is about 42438.7282561577. The cubic root of 1801045656 is about 1216.6759050361.

The spelling of 1801045656 in words is "one billion, eight hundred one million, forty-five thousand, six hundred fifty-six".