640501246515 has 32 divisors (see below), whose sum is σ = 1103736324096. Its totient is φ = 315294145920.

The previous prime is 640501246481. The next prime is 640501246547. The reversal of 640501246515 is 515642105046.

It is not a de Polignac number, because 640501246515 - 2¹⁰ = 640501245491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2010502 + ... + 2307188.

It is an arithmetic number, because the mean of its divisors is an integer number (34491760128).

Almost surely, 2^640501246515 is an apocalyptic number.

640501246515 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

640501246515 is a deficient number, since it is larger than the sum of its proper divisors (463235077581).

640501246515 is a wasteful number, since it uses less digits than its factorization.

640501246515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307779.

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 640501246515 in words is "six hundred forty billion, five hundred one million, two hundred forty-six thousand, five hundred fifteen".