99191428647 has 8 divisors (see below), whose sum is σ = 132256729344. Its totient is φ = 66126873528.

The previous prime is 99191428643. The next prime is 99191428649. The reversal of 99191428647 is 74682419199.

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

It is not a de Polignac number, because 99191428647 - 2² = 99191428643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99191428643) 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, 322588 + ... + 549950.

It is an arithmetic number, because the mean of its divisors is an integer number (16532091168).

Almost surely, 2^99191428647 is an apocalyptic number.

99191428647 is a deficient number, since it is larger than the sum of its proper divisors (33065300697).

99191428647 is a wasteful number, since it uses less digits than its factorization.

99191428647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372789.

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

The spelling of 99191428647 in words is "ninety-nine billion, one hundred ninety-one million, four hundred twenty-eight thousand, six hundred forty-seven".