99523493642 has 4 divisors (see below), whose sum is σ = 149285240466. Its totient is φ = 49761746820.

The previous prime is 99523493599. The next prime is 99523493653. The reversal of 99523493642 is 24639432599.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24639432599 = 13267 ⋅1857197.

It can be written as a sum of positive squares in only one way, i.e., 75739993681 + 23783499961 = 275209^2 + 154219^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24880873409 + ... + 24880873412.

Almost surely, 2^99523493642 is an apocalyptic number.

99523493642 is a deficient number, since it is larger than the sum of its proper divisors (49761746824).

99523493642 is a wasteful number, since it uses less digits than its factorization.

99523493642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49761746823.

The product of its digits is 12597120, while the sum is 56.

The spelling of 99523493642 in words is "ninety-nine billion, five hundred twenty-three million, four hundred ninety-three thousand, six hundred forty-two".