25061739481 has 9 divisors (see below), whose sum is σ = 26202562869. Its totient is φ = 23968615836.

The previous prime is 25061739467. The next prime is 25061739487. The reversal of 25061739481 is 18493716052.

The square root of 25061739481 is 158309.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-25061739481 is a prime.

It is a super-2 number, since 2×25061739481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25061739487) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3637666 + ... + 3644548.

It is a 2-persistent number, because it is pandigital, and so is 2⋅25061739481 = 50123478962, but 3⋅25061739481 = 75185218443 is not.

Almost surely, 2^25061739481 is an apocalyptic number.

25061739481 is the 158309-th square number.

25061739481 is the 79155-th centered octagonal number.

It is an amenable number.

25061739481 is a deficient number, since it is larger than the sum of its proper divisors (1140823388).

25061739481 is an frugal number, since it uses more digits than its factorization.

25061739481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13812 (or 6906 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 25061739481 in words is "twenty-five billion, sixty-one million, seven hundred thirty-nine thousand, four hundred eighty-one".