8391661026 has 32 divisors (see below), whose sum is σ = 19235932800. Its totient is φ = 2390743296.

The previous prime is 8391660997. The next prime is 8391661027. The reversal of 8391661026 is 6201661938.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8391661027) 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, 271591 + ... + 300906.

It is an arithmetic number, because the mean of its divisors is an integer number (601122900).

Almost surely, 2^8391661026 is an apocalyptic number.

8391661026 is an abundant number, since it is smaller than the sum of its proper divisors (10844271774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8391661026 is a wasteful number, since it uses less digits than its factorization.

8391661026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572858.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 8391661026 is about 91606.0097701019. The cubic root of 8391661026 is about 2032.1198160861.

The spelling of 8391661026 in words is "eight billion, three hundred ninety-one million, six hundred sixty-one thousand, twenty-six".