15639485993041 has 9 divisors (see below), whose sum is σ = 16506018812763. Its totient is φ = 14816283967080.

The previous prime is 15639485993029. The next prime is 15639485993057. The reversal of 15639485993041 is 14039958493651.

The square root of 15639485993041 is 3954679.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15036782197441 + 602703795600 = 3877729^2 + 776340^2 .

It is not a de Polignac number, because 15639485993041 - 2¹³ = 15639485984849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15639485993641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 75034831 + ... + 75242971.

It is an arithmetic number, because the mean of its divisors is an integer number (1834002090307).

Almost surely, 2^{15639485993041} is an apocalyptic number.

15639485993041 is the 3954679-th square number.

15639485993041 is the 1977340-th centered octagonal number.

It is an amenable number.

15639485993041 is a deficient number, since it is larger than the sum of its proper divisors (866532819722).

15639485993041 is an frugal number, since it uses more digits than its factorization.

15639485993041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416320 (or 208160 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 67.

The spelling of 15639485993041 in words is "fifteen trillion, six hundred thirty-nine billion, four hundred eighty-five million, nine hundred ninety-three thousand, forty-one".