99430128897 has 32 divisors (see below), whose sum is σ = 151988812800. Its totient is φ = 57268451520.

The previous prime is 99430128883. The next prime is 99430128899. The reversal of 99430128897 is 79882103499.

It is not a de Polignac number, because 99430128897 - 2²² = 99425934593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99430128897.

It is not an unprimeable number, because it can be changed into a prime (99430128899) 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, 894397 + ... + 999402.

It is an arithmetic number, because the mean of its divisors is an integer number (4749650400).

Almost surely, 2^99430128897 is an apocalyptic number.

It is an amenable number.

99430128897 is a deficient number, since it is larger than the sum of its proper divisors (52558683903).

99430128897 is a wasteful number, since it uses less digits than its factorization.

99430128897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893893.

The product of its (nonzero) digits is 7838208, while the sum is 60.

The spelling of 99430128897 in words is "ninety-nine billion, four hundred thirty million, one hundred twenty-eight thousand, eight hundred ninety-seven".