97704687666 has 32 divisors (see below), whose sum is σ = 195779422080. Its totient is φ = 32506596864.

The previous prime is 97704687659. The next prime is 97704687671. The reversal of 97704687666 is 66678640779.

It is a super-2 number, since 2×97704687666² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 97704687597 and 97704687606.

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, 18826600 + ... + 18831788.

It is an arithmetic number, because the mean of its divisors is an integer number (6118106940).

Almost surely, 2^97704687666 is an apocalyptic number.

97704687666 is an abundant number, since it is smaller than the sum of its proper divisors (98074734414).

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

97704687666 is a wasteful number, since it uses less digits than its factorization.

97704687666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10530.

The product of its (nonzero) digits is 128024064, while the sum is 66.

The spelling of 97704687666 in words is "ninety-seven billion, seven hundred four million, six hundred eighty-seven thousand, six hundred sixty-six".