64640631050727 has 32 divisors (see below), whose sum is σ = 87496664667840. Its totient is φ = 42444124800000.

The previous prime is 64640631050683. The next prime is 64640631050729. The reversal of 64640631050727 is 72705013604646.

It is not a de Polignac number, because 64640631050727 - 2⁶ = 64640631050663 is a prime.

It is a super-2 number, since 2×64640631050727² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64640631050727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640631050729) 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, 53276227 + ... + 54476027.

It is an arithmetic number, because the mean of its divisors is an integer number (2734270770870).

Almost surely, 2^{64640631050727} is an apocalyptic number.

64640631050727 is a deficient number, since it is larger than the sum of its proper divisors (22856033617113).

64640631050727 is a wasteful number, since it uses less digits than its factorization.

64640631050727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200835.

The product of its (nonzero) digits is 5080320, while the sum is 51.

The spelling of 64640631050727 in words is "sixty-four trillion, six hundred forty billion, six hundred thirty-one million, fifty thousand, seven hundred twenty-seven".