90685571983 has 2 divisors, whose sum is σ = 90685571984. Its totient is φ = 90685571982.

The previous prime is 90685571971. The next prime is 90685572031. The reversal of 90685571983 is 38917558609.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90685571983 - 2²¹ = 90683474831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90685574983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45342785991 + 45342785992.

It is an arithmetic number, because the mean of its divisors is an integer number (45342785992).

Almost surely, 2^90685571983 is an apocalyptic number.

90685571983 is a deficient number, since it is larger than the sum of its proper divisors (1).

90685571983 is an equidigital number, since it uses as much as digits as its factorization.

90685571983 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16329600, while the sum is 61.

The spelling of 90685571983 in words is "ninety billion, six hundred eighty-five million, five hundred seventy-one thousand, nine hundred eighty-three".