25951721896 has 16 divisors (see below), whose sum is σ = 48661277940. Its totient is φ = 12975381120.

The previous prime is 25951721879. The next prime is 25951721897. The reversal of 25951721896 is 69812715952.

It can be written as a sum of positive squares in 2 ways, for example, as 23374128996 + 2577592900 = 152886^2 + 50770^2 .

It is not an unprimeable number, because it can be changed into a prime (25951721897) 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, 290026 + ... + 368806.

Almost surely, 2^25951721896 is an apocalyptic number.

It is an amenable number.

25951721896 is a deficient number, since it is larger than the sum of its proper divisors (22709556044).

25951721896 is a wasteful number, since it uses less digits than its factorization.

25951721896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119964 (or 119960 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 55.

The spelling of 25951721896 in words is "twenty-five billion, nine hundred fifty-one million, seven hundred twenty-one thousand, eight hundred ninety-six".