1390278912664 has 8 divisors (see below), whose sum is σ = 2606772961260. Its totient is φ = 695139456328.

The previous prime is 1390278912623. The next prime is 1390278912677. The reversal of 1390278912664 is 4662198720931.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1390278912599 and 1390278912608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86892432034 + ... + 86892432049.

Almost surely, 2^{1390278912664} is an apocalyptic number.

It is an amenable number.

1390278912664 is a deficient number, since it is larger than the sum of its proper divisors (1216494048596).

1390278912664 is a wasteful number, since it uses less digits than its factorization.

1390278912664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173784864089 (or 173784864085 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 1390278912664 in words is "one trillion, three hundred ninety billion, two hundred seventy-eight million, nine hundred twelve thousand, six hundred sixty-four".