6638309278212 has 48 divisors (see below), whose sum is σ = 15908294630592. Its totient is φ = 2152928062080.

The previous prime is 6638309278129. The next prime is 6638309278247. The reversal of 6638309278212 is 2128729038366.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39080938 + ... + 39250430.

It is an arithmetic number, because the mean of its divisors is an integer number (331422804804).

Almost surely, 2^{6638309278212} is an apocalyptic number.

It is an amenable number.

6638309278212 is an abundant number, since it is smaller than the sum of its proper divisors (9269985352380).

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

6638309278212 is a wasteful number, since it uses less digits than its factorization.

6638309278212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257748 (or 257746 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 6638309278212 in words is "six trillion, six hundred thirty-eight billion, three hundred nine million, two hundred seventy-eight thousand, two hundred twelve".