99451370681 has 12 divisors (see below), whose sum is σ = 107703511740. Its totient is φ = 91789701120.

The previous prime is 99451370677. The next prime is 99451370713. The reversal of 99451370681 is 18607315499.

It can be written as a sum of positive squares in 6 ways, for example, as 9921156025 + 89530214656 = 99605^2 + 299216^2 .

It is not a de Polignac number, because 99451370681 - 2² = 99451370677 is a prime.

It is a super-2 number, since 2×99451370681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99451370621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1495385 + ... + 1560473.

It is an arithmetic number, because the mean of its divisors is an integer number (8975292645).

Almost surely, 2^99451370681 is an apocalyptic number.

It is an amenable number.

99451370681 is a deficient number, since it is larger than the sum of its proper divisors (8252141059).

99451370681 is a wasteful number, since it uses less digits than its factorization.

99451370681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74156 (or 74143 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 99451370681 in words is "ninety-nine billion, four hundred fifty-one million, three hundred seventy thousand, six hundred eighty-one".