64657650663 has 24 divisors (see below), whose sum is σ = 94359936528. Its totient is φ = 42660254592.

The previous prime is 64657650661. The next prime is 64657650667. The reversal of 64657650663 is 36605675646.

64657650663 is a `hidden beast` number, since 6 + 4 + 6 + 5 + 76 + 506 + 63 = 666.

It is not a de Polignac number, because 64657650663 - 2¹ = 64657650661 is a prime.

It is a super-2 number, since 2×64657650663² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64657650661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 962281 + ... + 1027277.

It is an arithmetic number, because the mean of its divisors is an integer number (3931664022).

Almost surely, 2^64657650663 is an apocalyptic number.

64657650663 is a deficient number, since it is larger than the sum of its proper divisors (29702285865).

64657650663 is a wasteful number, since it uses less digits than its factorization.

64657650663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66143 (or 66140 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 54.

The spelling of 64657650663 in words is "sixty-four billion, six hundred fifty-seven million, six hundred fifty thousand, six hundred sixty-three".