97666921 has 8 divisors (see below), whose sum is σ = 112813344. Its totient is φ = 83565120.

The previous prime is 97666913. The next prime is 97666927. The reversal of 97666921 is 12966679.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 97666921 - 2³ = 97666913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97666927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260955 + ... + 261328.

It is an arithmetic number, because the mean of its divisors is an integer number (14101668).

Almost surely, 2^97666921 is an apocalyptic number.

It is an amenable number.

97666921 is a deficient number, since it is larger than the sum of its proper divisors (15146423).

97666921 is a wasteful number, since it uses less digits than its factorization.

97666921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522311.

The product of its digits is 244944, while the sum is 46.

The square root of 97666921 is about 9882.6575879163. The cubic root of 97666921 is about 460.5207099672.

The spelling of 97666921 in words is "ninety-seven million, six hundred sixty-six thousand, nine hundred twenty-one".