8649137691 has 16 divisors (see below), whose sum is σ = 13111528320. Its totient is φ = 5631995880.

The previous prime is 8649137663. The next prime is 8649137701. The reversal of 8649137691 is 1967319468.

8649137691 is a `hidden beast` number, since 86 + 491 + 3 + 76 + 9 + 1 = 666.

It is not a de Polignac number, because 8649137691 - 2⁵ = 8649137659 is a prime.

It is a super-2 number, since 2×8649137691² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8649137291) 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, 3723705 + ... + 3726026.

It is an arithmetic number, because the mean of its divisors is an integer number (819470520).

Almost surely, 2^8649137691 is an apocalyptic number.

8649137691 is a deficient number, since it is larger than the sum of its proper divisors (4462390629).

8649137691 is a wasteful number, since it uses less digits than its factorization.

8649137691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7449783 (or 7449777 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 8649137691 is about 93000.7402712473. The cubic root of 8649137691 is about 2052.6942715038.

The spelling of 8649137691 in words is "eight billion, six hundred forty-nine million, one hundred thirty-seven thousand, six hundred ninety-one".