61806870912 has 64 divisors (see below), whose sum is σ = 166865949360. Its totient is φ = 20264540160.

The previous prime is 61806870901. The next prime is 61806870959. The reversal of 61806870912 is 21907860816.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 1295883 + ... + 1342730.

Almost surely, 2^61806870912 is an apocalyptic number.

It is an amenable number.

61806870912 is an abundant number, since it is smaller than the sum of its proper divisors (105059078448).

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

61806870912 is a wasteful number, since it uses less digits than its factorization.

61806870912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638691 (or 2638679 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 61806870912 in words is "sixty-one billion, eight hundred six million, eight hundred seventy thousand, nine hundred twelve".