15639485993042 has 16 divisors (see below), whose sum is σ = 23653340236152. Its totient is φ = 7755149760000.

The previous prime is 15639485993029. The next prime is 15639485993057. The reversal of 15639485993042 is 24039958493651.

It is a Cunningham number, because it is equal to 3954679²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 15639485993041 + 1 = 3954679^2 + 1^2 .

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, 27344459 + ... + 27910542.

Almost surely, 2^{15639485993042} is an apocalyptic number.

15639485993042 is a deficient number, since it is larger than the sum of its proper divisors (8013854243110).

15639485993042 is a wasteful number, since it uses less digits than its factorization.

15639485993042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55256173.

The product of its (nonzero) digits is 251942400, while the sum is 68.

The spelling of 15639485993042 in words is "fifteen trillion, six hundred thirty-nine billion, four hundred eighty-five million, nine hundred ninety-three thousand, forty-two".