90665579679 has 16 divisors (see below), whose sum is σ = 123766950912. Its totient is φ = 59005513728.

The previous prime is 90665579657. The next prime is 90665579687. The reversal of 90665579679 is 97697556609.

It is not a de Polignac number, because 90665579679 - 2⁷ = 90665579551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90665579639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42399 + ... + 427935.

It is an arithmetic number, because the mean of its divisors is an integer number (7735434432).

Almost surely, 2^90665579679 is an apocalyptic number.

90665579679 is a deficient number, since it is larger than the sum of its proper divisors (33101371233).

90665579679 is a wasteful number, since it uses less digits than its factorization.

90665579679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387406.

The product of its (nonzero) digits is 192893400, while the sum is 69.

The spelling of 90665579679 in words is "ninety billion, six hundred sixty-five million, five hundred seventy-nine thousand, six hundred seventy-nine".