64140400437 has 32 divisors (see below), whose sum is σ = 88562073600. Its totient is φ = 41266363008.

The previous prime is 64140400411. The next prime is 64140400453. The reversal of 64140400437 is 73400404146.

It is not a de Polignac number, because 64140400437 - 2⁷ = 64140400309 is a prime.

It is a super-2 number, since 2×64140400437² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64140400398 and 64140400407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64140407437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9542764 + ... + 9549482.

It is an arithmetic number, because the mean of its divisors is an integer number (2767564800).

Almost surely, 2^64140400437 is an apocalyptic number.

It is an amenable number.

64140400437 is a deficient number, since it is larger than the sum of its proper divisors (24421673163).

64140400437 is a wasteful number, since it uses less digits than its factorization.

64140400437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7705.

The product of its (nonzero) digits is 32256, while the sum is 33.

The spelling of 64140400437 in words is "sixty-four billion, one hundred forty million, four hundred thousand, four hundred thirty-seven".