90949691615 has 4 divisors (see below), whose sum is σ = 109139629944. Its totient is φ = 72759753288.

The previous prime is 90949691543. The next prime is 90949691621. The reversal of 90949691615 is 51619694909.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90949691615 - 2¹⁸ = 90949429471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9094969157 + ... + 9094969166.

It is an arithmetic number, because the mean of its divisors is an integer number (27284907486).

Almost surely, 2^90949691615 is an apocalyptic number.

90949691615 is a deficient number, since it is larger than the sum of its proper divisors (18189938329).

90949691615 is a wasteful number, since it uses less digits than its factorization.

90949691615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18189938328.

The product of its (nonzero) digits is 4723920, while the sum is 59.

The spelling of 90949691615 in words is "ninety billion, nine hundred forty-nine million, six hundred ninety-one thousand, six hundred fifteen".