640140655615 has 8 divisors (see below), whose sum is σ = 771382883520. Its totient is φ = 509969793312.

The previous prime is 640140655573. The next prime is 640140655667. The reversal of 640140655615 is 516556041046.

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 640140655615 - 2⁷ = 640140655487 is a prime.

It is a super-3 number, since 3×640140655615³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

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, 267840084 + ... + 267842473.

It is an arithmetic number, because the mean of its divisors is an integer number (96422860440).

Almost surely, 2^640140655615 is an apocalyptic number.

640140655615 is a deficient number, since it is larger than the sum of its proper divisors (131242227905).

640140655615 is a wasteful number, since it uses less digits than its factorization.

640140655615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535682801.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 640140655615 in words is "six hundred forty billion, one hundred forty million, six hundred fifty-five thousand, six hundred fifteen".