90919561895 has 4 divisors (see below), whose sum is σ = 109103474280. Its totient is φ = 72735649512.

The previous prime is 90919561877. The next prime is 90919561907. The reversal of 90919561895 is 59816591909.

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 90919561895 - 2⁸ = 90919561639 is a prime.

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, 9091956185 + ... + 9091956194.

It is an arithmetic number, because the mean of its divisors is an integer number (27275868570).

Almost surely, 2^90919561895 is an apocalyptic number.

90919561895 is a deficient number, since it is larger than the sum of its proper divisors (18183912385).

90919561895 is a wasteful number, since it uses less digits than its factorization.

90919561895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18183912384.

The product of its (nonzero) digits is 7873200, while the sum is 62.

The spelling of 90919561895 in words is "ninety billion, nine hundred nineteen million, five hundred sixty-one thousand, eight hundred ninety-five".