640176481615 has 48 divisors (see below), whose sum is σ = 890567065440. Its totient is φ = 438037678080.

The previous prime is 640176481613. The next prime is 640176481643. The reversal of 640176481615 is 516184671046.

It is not a de Polignac number, because 640176481615 - 2¹ = 640176481613 is a prime.

It is a super-2 number, since 2×640176481615² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640176481613) 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 47 ways as a sum of consecutive naturals, for example, 59330641 + ... + 59341429.

It is an arithmetic number, because the mean of its divisors is an integer number (18553480530).

Almost surely, 2^640176481615 is an apocalyptic number.

640176481615 is a deficient number, since it is larger than the sum of its proper divisors (250390583825).

640176481615 is a wasteful number, since it uses less digits than its factorization.

640176481615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14572 (or 14555 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 640176481615 in words is "six hundred forty billion, one hundred seventy-six million, four hundred eighty-one thousand, six hundred fifteen".