61316561984 has 14 divisors (see below), whose sum is σ = 121675052814. Its totient is φ = 30658280960.

The previous prime is 61316561959. The next prime is 61316561993. The reversal of 61316561984 is 48916561316.

It can be written as a sum of positive squares in only one way, i.e., 60677483584 + 639078400 = 246328^2 + 25280^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 479035577 + ... + 479035704.

It is an arithmetic number, because the mean of its divisors is an integer number (8691075201).

Almost surely, 2^61316561984 is an apocalyptic number.

61316561984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61316561984 is a deficient number, since it is larger than the sum of its proper divisors (60358490830).

61316561984 is an equidigital number, since it uses as much as digits as its factorization.

61316561984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958071293 (or 958071283 counting only the distinct ones).

The product of its digits is 933120, while the sum is 50.

The spelling of 61316561984 in words is "sixty-one billion, three hundred sixteen million, five hundred sixty-one thousand, nine hundred eighty-four".