391346066172 has 24 divisors (see below), whose sum is σ = 915588930256. Its totient is φ = 130098958848.

The previous prime is 391346066147. The next prime is 391346066203. The reversal of 391346066172 is 271660643193.

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, 43711573 + ... + 43720524.

Almost surely, 2^391346066172 is an apocalyptic number.

It is an amenable number.

391346066172 is an abundant number, since it is smaller than the sum of its proper divisors (524242864084).

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

391346066172 is a wasteful number, since it uses less digits than its factorization.

391346066172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87432477 (or 87432475 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 48.

The spelling of 391346066172 in words is "three hundred ninety-one billion, three hundred forty-six million, sixty-six thousand, one hundred seventy-two".