25541694738 has 128 divisors (see below), whose sum is σ = 66819686400. Its totient is φ = 7079223744.

The previous prime is 25541694721. The next prime is 25541694803. The reversal of 25541694738 is 83749614552.

It is a happy number.

25541694738 is a `hidden beast` number, since 2 + 5 + 5 + 4 + 169 + 473 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5018431 + ... + 5023517.

It is an arithmetic number, because the mean of its divisors is an integer number (522028800).

Almost surely, 2^25541694738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25541694738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33409843200).

25541694738 is an abundant number, since it is smaller than the sum of its proper divisors (41277991662).

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

25541694738 is a wasteful number, since it uses less digits than its factorization.

25541694738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5501 (or 5495 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 25541694738 in words is "twenty-five billion, five hundred forty-one million, six hundred ninety-four thousand, seven hundred thirty-eight".