640069050555 has 96 divisors (see below), whose sum is σ = 1233421413120. Its totient is φ = 304438176000.

The previous prime is 640069050547. The next prime is 640069050589. The reversal of 640069050555 is 555050960046.

640069050555 is a `hidden beast` number, since 6 + 4 + 0 + 0 + 6 + 90 + 5 + 0 + 555 = 666.

It is not a de Polignac number, because 640069050555 - 2³ = 640069050547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 640069050555.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11415940 + ... + 11471870.

It is an arithmetic number, because the mean of its divisors is an integer number (12848139720).

Almost surely, 2^640069050555 is an apocalyptic number.

640069050555 is a deficient number, since it is larger than the sum of its proper divisors (593352362565).

640069050555 is a wasteful number, since it uses less digits than its factorization.

640069050555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56393 (or 56390 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 640069050555 in words is "six hundred forty billion, sixty-nine million, fifty thousand, five hundred fifty-five".