61615574320 has 20 divisors (see below), whose sum is σ = 143256210480. Its totient is φ = 24646229696.

The previous prime is 61615574269. The next prime is 61615574327. The reversal of 61615574320 is 2347551616.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (61615574327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385097260 + ... + 385097419.

It is an arithmetic number, because the mean of its divisors is an integer number (7162810524).

Almost surely, 2^61615574320 is an apocalyptic number.

It is an amenable number.

61615574320 is an abundant number, since it is smaller than the sum of its proper divisors (81640636160).

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

61615574320 is a wasteful number, since it uses less digits than its factorization.

61615574320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770194692 (or 770194686 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 61615574320 in words is "sixty-one billion, six hundred fifteen million, five hundred seventy-four thousand, three hundred twenty".