25666070537 has 4 divisors (see below), whose sum is σ = 25733084160. Its totient is φ = 25599056916.

The previous prime is 25666070531. The next prime is 25666070557. The reversal of 25666070537 is 73507066652.

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 25666070537 - 2³² = 21371103241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25666070491 and 25666070500.

It is not an unprimeable number, because it can be changed into a prime (25666070531) 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, 33506237 + ... + 33507002.

It is an arithmetic number, because the mean of its divisors is an integer number (6433271040).

Almost surely, 2^25666070537 is an apocalyptic number.

It is an amenable number.

25666070537 is a deficient number, since it is larger than the sum of its proper divisors (67013623).

25666070537 is an equidigital number, since it uses as much as digits as its factorization.

25666070537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67013622.

The product of its (nonzero) digits is 1587600, while the sum is 47.

The spelling of 25666070537 in words is "twenty-five billion, six hundred sixty-six million, seventy thousand, five hundred thirty-seven".