90172214056 has 8 divisors (see below), whose sum is σ = 169072901370. Its totient is φ = 45086107024.

The previous prime is 90172214051. The next prime is 90172214063. The reversal of 90172214056 is 65041227109.

It can be written as a sum of positive squares in only one way, i.e., 57775813956 + 32396400100 = 240366^2 + 179990^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×90172214056² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90172214051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5635763371 + ... + 5635763386.

Almost surely, 2^90172214056 is an apocalyptic number.

It is an amenable number.

90172214056 is a deficient number, since it is larger than the sum of its proper divisors (78900687314).

90172214056 is a wasteful number, since it uses less digits than its factorization.

90172214056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11271526763 (or 11271526759 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 90172214056 in words is "ninety billion, one hundred seventy-two million, two hundred fourteen thousand, fifty-six".