981198447657 has 16 divisors (see below), whose sum is σ = 1310714130432. Its totient is φ = 652907909520.

The previous prime is 981198447629. The next prime is 981198447661. The reversal of 981198447657 is 756744891189.

981198447657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 981198447657 - 2³⁴ = 964018578473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 981198447591 and 981198447600.

It is not an unprimeable number, because it can be changed into a prime (981198487657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11168532 + ... + 11256042.

It is an arithmetic number, because the mean of its divisors is an integer number (81919633152).

Almost surely, 2^981198447657 is an apocalyptic number.

It is an amenable number.

981198447657 is a deficient number, since it is larger than the sum of its proper divisors (329515682775).

981198447657 is a wasteful number, since it uses less digits than its factorization.

981198447657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94468.

The product of its digits is 121927680, while the sum is 69.

The spelling of 981198447657 in words is "nine hundred eighty-one billion, one hundred ninety-eight million, four hundred forty-seven thousand, six hundred fifty-seven".