64500020715 has 64 divisors (see below), whose sum is σ = 111731622912. Its totient is φ = 31584883200.

The previous prime is 64500020713. The next prime is 64500020791. The reversal of 64500020715 is 51702000546.

It is not a de Polignac number, because 64500020715 - 2¹ = 64500020713 is a prime.

It is a super-2 number, since 2×64500020715² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64500020713) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41055880 + ... + 41057450.

It is an arithmetic number, because the mean of its divisors is an integer number (1745806608).

Almost surely, 2^64500020715 is an apocalyptic number.

64500020715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64500020715 is a deficient number, since it is larger than the sum of its proper divisors (47231602197).

64500020715 is a wasteful number, since it uses less digits than its factorization.

64500020715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580.

The product of its (nonzero) digits is 8400, while the sum is 30.

The spelling of 64500020715 in words is "sixty-four billion, five hundred million, twenty thousand, seven hundred fifteen".