25121616004 has 81 divisors (see below), whose sum is σ = 47997334917. Its totient is φ = 11503150848.

The previous prime is 25121615957. The next prime is 25121616007. The reversal of 25121616004 is 40061612152.

The square root of 25121616004 is 158498.

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

It can be written as a sum of positive squares in only one way, i.e., 11280564100 + 13841051904 = 106210^2 + 117648^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25121616007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 258985684 + ... + 258985780.

Almost surely, 2^25121616004 is an apocalyptic number.

25121616004 is the 158498-th square number.

It is an amenable number.

25121616004 is a deficient number, since it is larger than the sum of its proper divisors (22875718913).

25121616004 is an equidigital number, since it uses as much as digits as its factorization.

25121616004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 25121616004 in words is "twenty-five billion, one hundred twenty-one million, six hundred sixteen thousand, four".