25889504477929 has 27 divisors (see below), whose sum is σ = 26837482603383. Its totient is φ = 24974706942432.

The previous prime is 25889504477927. The next prime is 25889504477953. The reversal of 25889504477929 is 92977440598852.

The square root of 25889504477929 is 5088173.

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., 14696143938025 + 11193360539904 = 3833555^2 + 3345648^2 .

It is not a de Polignac number, because 25889504477929 - 2¹ = 25889504477927 is a prime.

It is a super-2 number, since 2×25889504477929² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25889504477927) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17457520822 + ... + 17457522304.

Almost surely, 2^{25889504477929} is an apocalyptic number.

25889504477929 is the 5088173-rd square number.

25889504477929 is the 2544087-th centered octagonal number.

It is an amenable number.

25889504477929 is a deficient number, since it is larger than the sum of its proper divisors (947978125454).

25889504477929 is an frugal number, since it uses more digits than its factorization.

25889504477929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206 (or 1603 counting only the distinct ones).

The product of its (nonzero) digits is 3657830400, while the sum is 79.

The spelling of 25889504477929 in words is "twenty-five trillion, eight hundred eighty-nine billion, five hundred four million, four hundred seventy-seven thousand, nine hundred twenty-nine".