25666070538 has 32 divisors (see below), whose sum is σ = 51711783552. Its totient is φ = 8492313600.

The previous prime is 25666070531. The next prime is 25666070557. The reversal of 25666070538 is 83507066652.

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 15 ways as a sum of consecutive naturals, for example, 421170 + ... + 478242.

It is an arithmetic number, because the mean of its divisors is an integer number (1615993236).

Almost surely, 2^25666070538 is an apocalyptic number.

25666070538 is an abundant number, since it is smaller than the sum of its proper divisors (26045713014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25666070538 is a wasteful number, since it uses less digits than its factorization.

25666070538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57630.

The product of its (nonzero) digits is 1814400, while the sum is 48.

The spelling of 25666070538 in words is "twenty-five billion, six hundred sixty-six million, seventy thousand, five hundred thirty-eight".