25135436557461 has 4 divisors (see below), whose sum is σ = 33513915409952. Its totient is φ = 16756957704972.

The previous prime is 25135436557459. The next prime is 25135436557559. The reversal of 25135436557461 is 16475563453152.

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 not a de Polignac number, because 25135436557461 - 2¹ = 25135436557459 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 (25135436557661) 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, 4189239426241 + ... + 4189239426246.

It is an arithmetic number, because the mean of its divisors is an integer number (8378478852488).

Almost surely, 2^{25135436557461} is an apocalyptic number.

It is an amenable number.

25135436557461 is a deficient number, since it is larger than the sum of its proper divisors (8378478852491).

25135436557461 is an equidigital number, since it uses as much as digits as its factorization.

25135436557461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8378478852490.

The product of its digits is 45360000, while the sum is 57.

The spelling of 25135436557461 in words is "twenty-five trillion, one hundred thirty-five billion, four hundred thirty-six million, five hundred fifty-seven thousand, four hundred sixty-one".