640415540515 has 8 divisors (see below), whose sum is σ = 770210229600. Its totient is φ = 511191378432.

The previous prime is 640415540497. The next prime is 640415540543. The reversal of 640415540515 is 515045514046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640415540515 - 2²⁹ = 639878669603 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142629279 + ... + 142633768.

It is an arithmetic number, because the mean of its divisors is an integer number (96276278700).

Almost surely, 2^640415540515 is an apocalyptic number.

640415540515 is a deficient number, since it is larger than the sum of its proper divisors (129794689085).

640415540515 is a wasteful number, since it uses less digits than its factorization.

640415540515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285263501.

The product of its (nonzero) digits is 240000, while the sum is 40.

The spelling of 640415540515 in words is "six hundred forty billion, four hundred fifteen million, five hundred forty thousand, five hundred fifteen".