25906391171 has 4 divisors (see below), whose sum is σ = 27430296552. Its totient is φ = 24382485792.

The previous prime is 25906391131. The next prime is 25906391201. The reversal of 25906391171 is 17119360952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25906391171 - 2¹⁴ = 25906374787 is a prime.

It is a super-2 number, since 2×25906391171² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25906391101) 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, 761952665 + ... + 761952698.

It is an arithmetic number, because the mean of its divisors is an integer number (6857574138).

Almost surely, 2^25906391171 is an apocalyptic number.

25906391171 is a deficient number, since it is larger than the sum of its proper divisors (1523905381).

25906391171 is a wasteful number, since it uses less digits than its factorization.

25906391171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523905380.

The product of its (nonzero) digits is 102060, while the sum is 44.

The spelling of 25906391171 in words is "twenty-five billion, nine hundred six million, three hundred ninety-one thousand, one hundred seventy-one".