64638897087 has 16 divisors (see below), whose sum is σ = 86632898048. Its totient is φ = 42869312640.

The previous prime is 64638897077. The next prime is 64638897097. The reversal of 64638897087 is 78079883646.

It is an interprime number because it is at equal distance from previous prime (64638897077) and next prime (64638897097).

It is not a de Polignac number, because 64638897087 - 2⁶ = 64638897023 is a prime.

It is a super-3 number, since 3×64638897087³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64638897077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389463 + ... + 530055.

It is an arithmetic number, because the mean of its divisors is an integer number (5414556128).

Almost surely, 2^64638897087 is an apocalyptic number.

64638897087 is a deficient number, since it is larger than the sum of its proper divisors (21994000961).

64638897087 is a wasteful number, since it uses less digits than its factorization.

64638897087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141390.

The product of its (nonzero) digits is 97542144, while the sum is 66.

The spelling of 64638897087 in words is "sixty-four billion, six hundred thirty-eight million, eight hundred ninety-seven thousand, eighty-seven".