25178390329 has 9 divisors (see below), whose sum is σ = 26324514853. Its totient is φ = 24080186812.

The previous prime is 25178390299. The next prime is 25178390339. The reversal of 25178390329 is 92309387152.

The square root of 25178390329 is 158677.

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

It is not a de Polignac number, because 25178390329 - 2¹³ = 25178382137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25178390339) 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, 3646122 + ... + 3653020.

Almost surely, 2^25178390329 is an apocalyptic number.

25178390329 is the 158677-th square number.

25178390329 is the 79339-th centered octagonal number.

It is an amenable number.

25178390329 is a deficient number, since it is larger than the sum of its proper divisors (1146124524).

25178390329 is an frugal number, since it uses more digits than its factorization.

25178390329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13844 (or 6922 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

Multiplying 25178390329 by its sum of digits (49), we get a square (1233741126121 = 1110739²).

The spelling of 25178390329 in words is "twenty-five billion, one hundred seventy-eight million, three hundred ninety thousand, three hundred twenty-nine".