640170012537 has 48 divisors (see below), whose sum is σ = 1072062501120. Its totient is φ = 363801638400.

The previous prime is 640170012523. The next prime is 640170012539. The reversal of 640170012537 is 735210071046.

It is a happy number.

640170012537 is a `hidden beast` number, since 6 + 40 + 1 + 70 + 0 + 12 + 537 = 666.

It is not a de Polignac number, because 640170012537 - 2¹⁰ = 640170011513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640170012539) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254289 + ... + 1159742.

It is an arithmetic number, because the mean of its divisors is an integer number (22334635440).

Almost surely, 2^640170012537 is an apocalyptic number.

It is an amenable number.

640170012537 is a deficient number, since it is larger than the sum of its proper divisors (431892488583).

640170012537 is a wasteful number, since it uses less digits than its factorization.

640170012537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414334 (or 1414331 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 640170012537 in words is "six hundred forty billion, one hundred seventy million, twelve thousand, five hundred thirty-seven".