56401665 has 48 divisors (see below), whose sum is σ = 99335808. Its totient is φ = 27231232.

The previous prime is 56401663. The next prime is 56401673. The reversal of 56401665 is 56610465.

56401665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56401665 - 2¹ = 56401663 is a prime.

It is a super-2 number, since 2×56401665² = 6362295629544450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56401663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214324 + ... + 214586.

It is an arithmetic number, because the mean of its divisors is an integer number (2069496).

Almost surely, 2^56401665 is an apocalyptic number.

It is an amenable number.

56401665 is a deficient number, since it is larger than the sum of its proper divisors (42934143).

56401665 is a wasteful number, since it uses less digits than its factorization.

56401665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 56401665 is about 7510.1041936847. The cubic root of 56401665 is about 383.4987695917.

The spelling of 56401665 in words is "fifty-six million, four hundred one thousand, six hundred sixty-five".