25438974016 has 21 divisors (see below), whose sum is σ = 50482996189. Its totient is φ = 12718849024.

The previous prime is 25438974013. The next prime is 25438974019. The reversal of 25438974016 is 61047983452.

It is a happy number.

The square root of 25438974016 is 159496.

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

It is an interprime number because it is at equal distance from previous prime (25438974013) and next prime (25438974019).

It can be written as a sum of positive squares in only one way, i.e., 4499726400 + 20939247616 = 67080^2 + 144704^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25438974013) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1266000 + ... + 1285936.

It is a 1-persistent number, because it is pandigital, but 2⋅25438974016 = 50877948032 is not.

Almost surely, 2^25438974016 is an apocalyptic number.

25438974016 is the 159496-th square number.

It is an amenable number.

25438974016 is a deficient number, since it is larger than the sum of its proper divisors (25044022173).

25438974016 is an frugal number, since it uses more digits than its factorization.

25438974016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39886 (or 19939 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

Multiplying 25438974016 by its sum of digits (49), we get a square (1246509726784 = 1116472²).

The spelling of 25438974016 in words is "twenty-five billion, four hundred thirty-eight million, nine hundred seventy-four thousand, sixteen".