870644056642646 has 48 divisors (see below), whose sum is σ = 1542728820141360. Its totient is φ = 365301204802560.

The previous prime is 870644056642631. The next prime is 870644056642651. The reversal of 870644056642646 is 646246650446078.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351951410 + ... + 354416538.

It is an arithmetic number, because the mean of its divisors is an integer number (32140183752945).

Almost surely, 2^{870644056642646} is an apocalyptic number.

870644056642646 is a deficient number, since it is larger than the sum of its proper divisors (672084763498714).

870644056642646 is a wasteful number, since it uses less digits than its factorization.

870644056642646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560161 (or 2560148 counting only the distinct ones).

The product of its (nonzero) digits is 1114767360, while the sum is 68.

The spelling of 870644056642646 in words is "eight hundred seventy trillion, six hundred forty-four billion, fifty-six million, six hundred forty-two thousand, six hundred forty-six".