61404972064 has 24 divisors (see below), whose sum is σ = 120897217980. Its totient is φ = 30700916736.

The previous prime is 61404972047. The next prime is 61404972119. The reversal of 61404972064 is 46027940416.

It can be written as a sum of positive squares in 2 ways, for example, as 38379944464 + 23025027600 = 195908^2 + 151740^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61404972064.

It is an unprimeable number.

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, 828232 + ... + 899320.

Almost surely, 2^61404972064 is an apocalyptic number.

It is an amenable number.

61404972064 is a deficient number, since it is larger than the sum of its proper divisors (59492245916).

61404972064 is a wasteful number, since it uses less digits than its factorization.

61404972064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98092 (or 98084 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 61404972064 in words is "sixty-one billion, four hundred four million, nine hundred seventy-two thousand, sixty-four".