99881478151 has 32 divisors (see below), whose sum is σ = 126241210368. Its totient is φ = 76917755520.

The previous prime is 99881478143. The next prime is 99881478161. The reversal of 99881478151 is 15187418899.

It is a cyclic number.

It is not a de Polignac number, because 99881478151 - 2³ = 99881478143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99881478151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99881478101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 709626 + ... + 838648.

It is an arithmetic number, because the mean of its divisors is an integer number (3945037824).

Almost surely, 2^99881478151 is an apocalyptic number.

99881478151 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

99881478151 is the 258046-th pentagonal number.

99881478151 is a deficient number, since it is larger than the sum of its proper divisors (26359732217).

99881478151 is a wasteful number, since it uses less digits than its factorization.

99881478151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129271.

The product of its digits is 5806080, while the sum is 61.

The spelling of 99881478151 in words is "ninety-nine billion, eight hundred eighty-one million, four hundred seventy-eight thousand, one hundred fifty-one".