25809707716 has 81 divisors (see below), whose sum is σ = 50569010919. Its totient is φ = 11520819648.

The previous prime is 25809707659. The next prime is 25809707779. The reversal of 25809707716 is 61770790852.

The square root of 25809707716 is 160654.

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

It can be written as a sum of positive squares in 4 ways, for example, as 107205316 + 25702502400 = 10354^2 + 160320^2 .

It is a super-2 number, since 2×25809707716² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 154549065 + ... + 154549231.

Almost surely, 2^25809707716 is an apocalyptic number.

25809707716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25809707716 is the 160654-th square number.

It is an amenable number.

25809707716 is a deficient number, since it is larger than the sum of its proper divisors (24759303203).

25809707716 is a wasteful number, since it uses less digits than its factorization.

25809707716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 52.

The spelling of 25809707716 in words is "twenty-five billion, eight hundred nine million, seven hundred seven thousand, seven hundred sixteen".