89018949857 has 2 divisors, whose sum is σ = 89018949858. Its totient is φ = 89018949856.

The previous prime is 89018949839. The next prime is 89018949863. The reversal of 89018949857 is 75894981098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73056143521 + 15962806336 = 270289^2 + 126344^2 .

It is a cyclic number.

It is not a de Polignac number, because 89018949857 - 2⁶ = 89018949793 is a prime.

It is not a weakly prime, because it can be changed into another prime (89018949457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44509474928 + 44509474929.

It is an arithmetic number, because the mean of its divisors is an integer number (44509474929).

Almost surely, 2^89018949857 is an apocalyptic number.

It is an amenable number.

89018949857 is a deficient number, since it is larger than the sum of its proper divisors (1).

89018949857 is an equidigital number, since it uses as much as digits as its factorization.

89018949857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52254720, while the sum is 68.

The spelling of 89018949857 in words is "eighty-nine billion, eighteen million, nine hundred forty-nine thousand, eight hundred fifty-seven".