89201668981 has 2 divisors, whose sum is σ = 89201668982. Its totient is φ = 89201668980.

The previous prime is 89201668937. The next prime is 89201669033. The reversal of 89201668981 is 18986610298.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84817242756 + 4384426225 = 291234^2 + 66215^2 .

It is a cyclic number.

It is not a de Polignac number, because 89201668981 - 2¹⁵ = 89201636213 is a prime.

It is a super-2 number, since 2×89201668981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89201668681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44600834490 + 44600834491.

It is an arithmetic number, because the mean of its divisors is an integer number (44600834491).

Almost surely, 2^89201668981 is an apocalyptic number.

It is an amenable number.

89201668981 is a deficient number, since it is larger than the sum of its proper divisors (1).

89201668981 is an equidigital number, since it uses as much as digits as its factorization.

89201668981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 58.

The spelling of 89201668981 in words is "eighty-nine billion, two hundred one million, six hundred sixty-eight thousand, nine hundred eighty-one".