640212551572 has 24 divisors (see below), whose sum is σ = 1222608455712. Its totient is φ = 290914159200.

The previous prime is 640212551557. The next prime is 640212551581. The reversal of 640212551572 is 275155212046.

It is a happy number.

It is a super-2 number, since 2×640212551572² (a number of 24 digits) contains 22 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, 2147098 + ... + 2427025.

It is an arithmetic number, because the mean of its divisors is an integer number (50942018988).

Almost surely, 2^640212551572 is an apocalyptic number.

It is an amenable number.

640212551572 is a deficient number, since it is larger than the sum of its proper divisors (582395904140).

640212551572 is a wasteful number, since it uses less digits than its factorization.

640212551572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4577319 (or 4577317 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 640212551572 in words is "six hundred forty billion, two hundred twelve million, five hundred fifty-one thousand, five hundred seventy-two".