99990440642 has 16 divisors (see below), whose sum is σ = 159176835072. Its totient is φ = 46945143360.

The previous prime is 99990440639. The next prime is 99990440657. The reversal of 99990440642 is 24604409999.

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, 3397058 + ... + 3426365.

It is an arithmetic number, because the mean of its divisors is an integer number (9948552192).

Almost surely, 2^99990440642 is an apocalyptic number.

99990440642 is a deficient number, since it is larger than the sum of its proper divisors (59186394430).

99990440642 is a wasteful number, since it uses less digits than its factorization.

99990440642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823873.

The product of its (nonzero) digits is 5038848, while the sum is 56.

The spelling of 99990440642 in words is "ninety-nine billion, nine hundred ninety million, four hundred forty thousand, six hundred forty-two".