9907990698691 has 16 divisors (see below), whose sum is σ = 10363556586240. Its totient is φ = 9460332070560.

The previous prime is 9907990698649. The next prime is 9907990698737. The reversal of 9907990698691 is 1968960997099.

It is a cyclic number.

It is not a de Polignac number, because 9907990698691 - 2¹⁹ = 9907990174403 is a prime.

It is a super-2 number, since 2×9907990698691² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9907990698091) 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, 1024191 + ... + 4567816.

It is an arithmetic number, because the mean of its divisors is an integer number (647722286640).

Almost surely, 2^{9907990698691} is an apocalyptic number.

9907990698691 is a deficient number, since it is larger than the sum of its proper divisors (455565887549).

9907990698691 is a wasteful number, since it uses less digits than its factorization.

9907990698691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592714.

The product of its (nonzero) digits is 1071385056, while the sum is 82.

The spelling of 9907990698691 in words is "nine trillion, nine hundred seven billion, nine hundred ninety million, six hundred ninety-eight thousand, six hundred ninety-one".