61900063872 has 32 divisors (see below), whose sum is σ = 164422045680. Its totient is φ = 20633354496.

The previous prime is 61900063871. The next prime is 61900063889. The reversal of 61900063872 is 27836000916.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (61900063871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80598658 + ... + 80599425.

Almost surely, 2^61900063872 is an apocalyptic number.

It is an amenable number.

61900063872 is an abundant number, since it is smaller than the sum of its proper divisors (102521981808).

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

61900063872 is a wasteful number, since it uses less digits than its factorization.

61900063872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161198100 (or 161198088 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 61900063872 in words is "sixty-one billion, nine hundred million, sixty-three thousand, eight hundred seventy-two".