97661112720 has 80 divisors (see below), whose sum is σ = 302780531520. Its totient is φ = 26040289792.

The previous prime is 97661112683. The next prime is 97661112737. The reversal of 97661112720 is 2721116679.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3698926 + ... + 3725234.

It is an arithmetic number, because the mean of its divisors is an integer number (3784756644).

Almost surely, 2^97661112720 is an apocalyptic number.

It is an amenable number.

97661112720 is an abundant number, since it is smaller than the sum of its proper divisors (205119418800).

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

97661112720 is a wasteful number, since it uses less digits than its factorization.

97661112720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41792 (or 41786 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The spelling of 97661112720 in words is "ninety-seven billion, six hundred sixty-one million, one hundred twelve thousand, seven hundred twenty".