15625265055591 has 4 divisors (see below), whose sum is σ = 20833686740792. Its totient is φ = 10416843370392.

The previous prime is 15625265055581. The next prime is 15625265055599. The reversal of 15625265055591 is 19555056252651.

It is a happy number.

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

It is not a de Polignac number, because 15625265055591 - 2¹⁵ = 15625265022823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15625265055599) 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, 2604210842596 + ... + 2604210842601.

It is an arithmetic number, because the mean of its divisors is an integer number (5208421685198).

Almost surely, 2^{15625265055591} is an apocalyptic number.

15625265055591 is a deficient number, since it is larger than the sum of its proper divisors (5208421685201).

15625265055591 is an equidigital number, since it uses as much as digits as its factorization.

15625265055591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5208421685200.

The product of its (nonzero) digits is 20250000, while the sum is 57.

The spelling of 15625265055591 in words is "fifteen trillion, six hundred twenty-five billion, two hundred sixty-five million, fifty-five thousand, five hundred ninety-one".