25618461812 has 48 divisors (see below), whose sum is σ = 47092851792. Its totient is φ = 12182277120.

The previous prime is 25618461779. The next prime is 25618461823. The reversal of 25618461812 is 21816481652.

It can be written as a sum of positive squares in 8 ways, for example, as 275095396 + 25343366416 = 16586^2 + 159196^2 .

It is a super-2 number, since 2×25618461812² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1355258 + ... + 1374030.

It is an arithmetic number, because the mean of its divisors is an integer number (981101079).

Almost surely, 2^25618461812 is an apocalyptic number.

It is an amenable number.

25618461812 is a deficient number, since it is larger than the sum of its proper divisors (21474389980).

25618461812 is a wasteful number, since it uses less digits than its factorization.

25618461812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19028 (or 19026 counting only the distinct ones).

The product of its digits is 184320, while the sum is 44.

The spelling of 25618461812 in words is "twenty-five billion, six hundred eighteen million, four hundred sixty-one thousand, eight hundred twelve".