53561649978 has 40 divisors (see below), whose sum is σ = 122571358272. Its totient is φ = 17474010984.

The previous prime is 53561649961. The next prime is 53561650001. The reversal of 53561649978 is 87994616535.

53561649978 is a `hidden beast` number, since 5 + 3 + 5 + 616 + 4 + 9 + 9 + 7 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3509700 + ... + 3524927.

Almost surely, 2^53561649978 is an apocalyptic number.

53561649978 is an abundant number, since it is smaller than the sum of its proper divisors (69009708294).

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

53561649978 is a wasteful number, since it uses less digits than its factorization.

53561649978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034688 (or 7034679 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 53561649978 in words is "fifty-three billion, five hundred sixty-one million, six hundred forty-nine thousand, nine hundred seventy-eight".