25840971946 has 16 divisors (see below), whose sum is σ = 39016949760. Its totient is φ = 12835358640.

The previous prime is 25840971931. The next prime is 25840971967. The reversal of 25840971946 is 64917904852.

It is a super-2 number, since 2×25840971946² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2768275 + ... + 2777593.

It is an arithmetic number, because the mean of its divisors is an integer number (2438559360).

Almost surely, 2^25840971946 is an apocalyptic number.

25840971946 is a deficient number, since it is larger than the sum of its proper divisors (13175977814).

25840971946 is a wasteful number, since it uses less digits than its factorization.

25840971946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18309.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 25840971946 in words is "twenty-five billion, eight hundred forty million, nine hundred seventy-one thousand, nine hundred forty-six".