25677819049 has 3 divisors (see below), whose sum is σ = 25677979293. Its totient is φ = 25677658806.

The previous prime is 25677819007. The next prime is 25677819061. The reversal of 25677819049 is 94091877652.

The square root of 25677819049 is 160243.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 25677819049 - 2⁷ = 25677818921 is a prime.

It is a super-2 number, since 2×25677819049² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25677818984 and 25677819002.

It is not an unprimeable number, because it can be changed into a prime (25677810049) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 80122 + ... + 240364.

It is an arithmetic number, because the mean of its divisors is an integer number (8559326431).

Almost surely, 2^25677819049 is an apocalyptic number.

25677819049 is the 160243-rd square number.

25677819049 is the 80122-nd centered octagonal number.

It is an amenable number.

25677819049 is a deficient number, since it is larger than the sum of its proper divisors (160244).

25677819049 is an frugal number, since it uses more digits than its factorization.

25677819049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320486 (or 160243 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 25677819049 in words is "twenty-five billion, six hundred seventy-seven million, eight hundred nineteen thousand, forty-nine".