97661278220 has 24 divisors (see below), whose sum is σ = 223733110608. Its totient is φ = 35513192000.

The previous prime is 97661278219. The next prime is 97661278243. The reversal of 97661278220 is 2287216679.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221957231 + ... + 221957670.

It is an arithmetic number, because the mean of its divisors is an integer number (9322212942).

Almost surely, 2^97661278220 is an apocalyptic number.

It is an amenable number.

97661278220 is an abundant number, since it is smaller than the sum of its proper divisors (126071832388).

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

97661278220 is a wasteful number, since it uses less digits than its factorization.

97661278220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443914921 (or 443914919 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 97661278220 in words is "ninety-seven billion, six hundred sixty-one million, two hundred seventy-eight thousand, two hundred twenty".