15520125265979 has 4 divisors (see below), whose sum is σ = 15545693841984. Its totient is φ = 15494556689976.

The previous prime is 15520125265951. The next prime is 15520125265991. The reversal of 15520125265979 is 97956252102551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15520125265979 - 2³⁶ = 15451405789243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15520125565979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12784287092 + ... + 12784288305.

It is an arithmetic number, because the mean of its divisors is an integer number (3886423460496).

Almost surely, 2^{15520125265979} is an apocalyptic number.

15520125265979 is a deficient number, since it is larger than the sum of its proper divisors (25568576005).

15520125265979 is an equidigital number, since it uses as much as digits as its factorization.

15520125265979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25568576004.

The product of its (nonzero) digits is 17010000, while the sum is 59.

The spelling of 15520125265979 in words is "fifteen trillion, five hundred twenty billion, one hundred twenty-five million, two hundred sixty-five thousand, nine hundred seventy-nine".