25121424397 has 4 divisors (see below), whose sum is σ = 25271852256. Its totient is φ = 24970996540.

The previous prime is 25121424371. The next prime is 25121424401. The reversal of 25121424397 is 79342412152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25121424397 - 2³¹ = 22973940749 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 (25121421397) 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, 75213679 + ... + 75214012.

It is an arithmetic number, because the mean of its divisors is an integer number (6317963064).

Almost surely, 2^25121424397 is an apocalyptic number.

It is an amenable number.

25121424397 is a deficient number, since it is larger than the sum of its proper divisors (150427859).

25121424397 is a wasteful number, since it uses less digits than its factorization.

25121424397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150427858.

The product of its digits is 120960, while the sum is 40.

The spelling of 25121424397 in words is "twenty-five billion, one hundred twenty-one million, four hundred twenty-four thousand, three hundred ninety-seven".