89889633857 has 4 divisors (see below), whose sum is σ = 95177259396. Its totient is φ = 84602008320.

The previous prime is 89889633833. The next prime is 89889633877. The reversal of 89889633857 is 75833698898.

It is a Cunningham number, because it is equal to 299816²+1.

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 69983527936 + 19906105921 = 264544^2 + 141089^2 .

It is a cyclic number.

It is not a de Polignac number, because 89889633857 - 2⁶ = 89889633793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89889633877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2643812744 + ... + 2643812777.

It is an arithmetic number, because the mean of its divisors is an integer number (23794314849).

Almost surely, 2^89889633857 is an apocalyptic number.

It is an amenable number.

89889633857 is a deficient number, since it is larger than the sum of its proper divisors (5287625539).

89889633857 is a wasteful number, since it uses less digits than its factorization.

89889633857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287625538.

The product of its digits is 627056640, while the sum is 74.

The spelling of 89889633857 in words is "eighty-nine billion, eight hundred eighty-nine million, six hundred thirty-three thousand, eight hundred fifty-seven".