25157761449 has 4 divisors (see below), whose sum is σ = 33543681936. Its totient is φ = 16771840964.

The previous prime is 25157761439. The next prime is 25157761451. The reversal of 25157761449 is 94416775152.

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 a de Polignac number, because none of the positive numbers 2^k-25157761449 is a prime.

It is a super-2 number, since 2×25157761449² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25157761439) 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, 4192960239 + ... + 4192960244.

It is an arithmetic number, because the mean of its divisors is an integer number (8385920484).

Almost surely, 2^25157761449 is an apocalyptic number.

It is an amenable number.

25157761449 is a deficient number, since it is larger than the sum of its proper divisors (8385920487).

25157761449 is an equidigital number, since it uses as much as digits as its factorization.

25157761449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8385920486.

The product of its digits is 2116800, while the sum is 51.

The spelling of 25157761449 in words is "twenty-five billion, one hundred fifty-seven million, seven hundred sixty-one thousand, four hundred forty-nine".