25725982077 has 14 divisors (see below), whose sum is σ = 38571329502. Its totient is φ = 17150654232.

The previous prime is 25725982069. The next prime is 25725982091. The reversal of 25725982077 is 77028952752.

25725982077 is a `hidden beast` number, since 25 + 7 + 2 + 598 + 20 + 7 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13000788441 + 12725193636 = 114021^2 + 112806^2 .

It is not a de Polignac number, because 25725982077 - 2³ = 25725982069 is a prime.

It is a super-2 number, since 2×25725982077² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25725981077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 17643978 + ... + 17645435.

Almost surely, 2^25725982077 is an apocalyptic number.

25725982077 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25725982077 is a deficient number, since it is larger than the sum of its proper divisors (12845347425).

25725982077 is an frugal number, since it uses more digits than its factorization.

25725982077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35289431 (or 35289416 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 54.

The spelling of 25725982077 in words is "twenty-five billion, seven hundred twenty-five million, nine hundred eighty-two thousand, seventy-seven".