90377875991 has 4 divisors (see below), whose sum is σ = 97330020312. Its totient is φ = 83425731672.

The previous prime is 90377875961. The next prime is 90377875993. The reversal of 90377875991 is 19957877309.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90377875991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90377875993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476072141 + ... + 3476072166.

It is an arithmetic number, because the mean of its divisors is an integer number (24332505078).

Almost surely, 2^90377875991 is an apocalyptic number.

90377875991 is a deficient number, since it is larger than the sum of its proper divisors (6952144321).

90377875991 is a wasteful number, since it uses less digits than its factorization.

90377875991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6952144320.

The product of its (nonzero) digits is 30005640, while the sum is 65.

The spelling of 90377875991 in words is "ninety billion, three hundred seventy-seven million, eight hundred seventy-five thousand, nine hundred ninety-one".