97721166 has 32 divisors (see below), whose sum is σ = 198144000. Its totient is φ = 32126976.

The previous prime is 97721149. The next prime is 97721171. The reversal of 97721166 is 66112779.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195585 + ... + 196083.

It is an arithmetic number, because the mean of its divisors is an integer number (6192000).

Almost surely, 2^97721166 is an apocalyptic number.

97721166 is an abundant number, since it is smaller than the sum of its proper divisors (100422834).

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

97721166 is a wasteful number, since it uses less digits than its factorization.

97721166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888.

The product of its digits is 31752, while the sum is 39.

The square root of 97721166 is about 9885.4016610353. The cubic root of 97721166 is about 460.6059531666.

The spelling of 97721166 in words is "ninety-seven million, seven hundred twenty-one thousand, one hundred sixty-six".