25221251757155 has 4 divisors (see below), whose sum is σ = 30265502108592. Its totient is φ = 20177001405720.

The previous prime is 25221251757127. The next prime is 25221251757173. The reversal of 25221251757155 is 55175715212252.

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

It is not a de Polignac number, because 25221251757155 - 2¹⁰ = 25221251756131 is a prime.

It is a super-2 number, since 2×25221251757155² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2522125175711 + ... + 2522125175720.

It is an arithmetic number, because the mean of its divisors is an integer number (7566375527148).

Almost surely, 2^{25221251757155} is an apocalyptic number.

25221251757155 is a deficient number, since it is larger than the sum of its proper divisors (5044250351437).

25221251757155 is an equidigital number, since it uses as much as digits as its factorization.

25221251757155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044250351436.

The product of its digits is 2450000, while the sum is 50.

The spelling of 25221251757155 in words is "twenty-five trillion, two hundred twenty-one billion, two hundred fifty-one million, seven hundred fifty-seven thousand, one hundred fifty-five".