6642540772 has 24 divisors (see below), whose sum is σ = 13327816320. Its totient is φ = 2837645760.

The previous prime is 6642540743. The next prime is 6642540787. The reversal of 6642540772 is 2770452466.

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, 372697 + ... + 390112.

It is an arithmetic number, because the mean of its divisors is an integer number (555325680).

Almost surely, 2^6642540772 is an apocalyptic number.

It is an amenable number.

6642540772 is an abundant number, since it is smaller than the sum of its proper divisors (6685275548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6642540772 is a wasteful number, since it uses less digits than its factorization.

6642540772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763131 (or 763129 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 43.

The square root of 6642540772 is about 81501.7838577782. The cubic root of 6642540772 is about 1879.7989799401.

The spelling of 6642540772 in words is "six billion, six hundred forty-two million, five hundred forty thousand, seven hundred seventy-two".