99991764142742 has 16 divisors (see below), whose sum is σ = 154041877861872. Its totient is φ = 48644480495520.

The previous prime is 99991764142729. The next prime is 99991764142789. The reversal of 99991764142742 is 24724146719999.

It is a Harshad number since it is a multiple of its sum of digits (74).

It is a self number, because there is not a number n which added to its sum of digits gives 99991764142742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21943913 + ... + 26105915.

It is an arithmetic number, because the mean of its divisors is an integer number (9627617366367).

Almost surely, 2^{99991764142742} is an apocalyptic number.

99991764142742 is a deficient number, since it is larger than the sum of its proper divisors (54050113719130).

99991764142742 is a wasteful number, since it uses less digits than its factorization.

99991764142742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4486703.

The product of its digits is 493807104, while the sum is 74.

The spelling of 99991764142742 in words is "ninety-nine trillion, nine hundred ninety-one billion, seven hundred sixty-four million, one hundred forty-two thousand, seven hundred forty-two".