90845863945 has 4 divisors (see below), whose sum is σ = 109015036740. Its totient is φ = 72676691152.

The previous prime is 90845863931. The next prime is 90845863991. The reversal of 90845863945 is 54936854809.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21933313801 + 68912550144 = 148099^2 + 262512^2 .

It is a cyclic number.

It is not a de Polignac number, because 90845863945 - 2⁷ = 90845863817 is a prime.

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, 9084586390 + ... + 9084586399.

It is an arithmetic number, because the mean of its divisors is an integer number (27253759185).

Almost surely, 2^90845863945 is an apocalyptic number.

It is an amenable number.

90845863945 is a deficient number, since it is larger than the sum of its proper divisors (18169172795).

90845863945 is a wasteful number, since it uses less digits than its factorization.

90845863945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18169172794.

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 90845863945 in words is "ninety billion, eight hundred forty-five million, eight hundred sixty-three thousand, nine hundred forty-five".