99999998551 has 8 divisors (see below), whose sum is σ = 100169501904. Its totient is φ = 99830640000.

The previous prime is 99999998513. The next prime is 99999998573. The reversal of 99999998551 is 15589999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999998551 - 2²⁷ = 99865780823 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999998591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1393551 + ... + 1463551.

It is an arithmetic number, because the mean of its divisors is an integer number (12521187738).

Almost surely, 2^99999998551 is an apocalyptic number.

99999998551 is a deficient number, since it is larger than the sum of its proper divisors (169503353).

99999998551 is a wasteful number, since it uses less digits than its factorization.

99999998551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72401.

The product of its digits is 956593800, while the sum is 82.

The spelling of 99999998551 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-eight thousand, five hundred fifty-one".