25537680061 has 4 divisors (see below), whose sum is σ = 26361476224. Its totient is φ = 24713883900.

The previous prime is 25537680043. The next prime is 25537680083. The reversal of 25537680061 is 16008673552.

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 25537680061 - 2⁷ = 25537679933 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 (25537680761) 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, 411898035 + ... + 411898096.

It is an arithmetic number, because the mean of its divisors is an integer number (6590369056).

Almost surely, 2^25537680061 is an apocalyptic number.

It is an amenable number.

25537680061 is a deficient number, since it is larger than the sum of its proper divisors (823796163).

25537680061 is an equidigital number, since it uses as much as digits as its factorization.

25537680061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823796162.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 25537680061 in words is "twenty-five billion, five hundred thirty-seven million, six hundred eighty thousand, sixty-one".