77959561580 has 96 divisors (see below), whose sum is σ = 176925154560. Its totient is φ = 28759691520.

The previous prime is 77959561573. The next prime is 77959561601. The reversal of 77959561580 is 8516595977.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5008610 + ... + 5024150.

It is an arithmetic number, because the mean of its divisors is an integer number (1842970360).

Almost surely, 2^77959561580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77959561580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88462577280).

77959561580 is an abundant number, since it is smaller than the sum of its proper divisors (98965592980).

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

77959561580 is a wasteful number, since it uses less digits than its factorization.

77959561580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15919 (or 15917 counting only the distinct ones).

The product of its (nonzero) digits is 23814000, while the sum is 62.

The spelling of 77959561580 in words is "seventy-seven billion, nine hundred fifty-nine million, five hundred sixty-one thousand, five hundred eighty".