99911778517442 has 8 divisors (see below), whose sum is σ = 149868354491136. Its totient is φ = 49955660353732.

The previous prime is 99911778517373. The next prime is 99911778517493. The reversal of 99911778517442 is 24471587711999.

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

It is a self number, because there is not a number n which added to its sum of digits gives 99911778517442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113906378 + ... + 114780165.

It is an arithmetic number, because the mean of its divisors is an integer number (18733544311392).

Almost surely, 2^{99911778517442} is an apocalyptic number.

99911778517442 is a deficient number, since it is larger than the sum of its proper divisors (49956575973694).

99911778517442 is a wasteful number, since it uses less digits than its factorization.

99911778517442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228904992.

The product of its digits is 320060160, while the sum is 74.

The spelling of 99911778517442 in words is "ninety-nine trillion, nine hundred eleven billion, seven hundred seventy-eight million, five hundred seventeen thousand, four hundred forty-two".