25099007831881 has 3 divisors (see below), whose sum is σ = 25099012841773. Its totient is φ = 25099002821990.

The previous prime is 25099007831879. The next prime is 25099007831927. The reversal of 25099007831881 is 18813870099052.

The square root of 25099007831881 is 5009891.

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 25099007831881 - 2¹ = 25099007831879 is a prime.

It is a super-2 number, since 2×25099007831881² (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 (25099007831801) 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, 2504946 + ... + 7514836.

Almost surely, 2^{25099007831881} is an apocalyptic number.

25099007831881 is the 5009891-st square number.

25099007831881 is the 2504946-th centered octagonal number.

It is an amenable number.

25099007831881 is a deficient number, since it is larger than the sum of its proper divisors (5009892).

25099007831881 is an frugal number, since it uses more digits than its factorization.

25099007831881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10019782 (or 5009891 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 61.

The spelling of 25099007831881 in words is "twenty-five trillion, ninety-nine billion, seven million, eight hundred thirty-one thousand, eight hundred eighty-one".