25573163381 has 4 divisors (see below), whose sum is σ = 25744795500. Its totient is φ = 25401531264.

The previous prime is 25573163377. The next prime is 25573163383. The reversal of 25573163381 is 18336137552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 974064100 + 24599099281 = 31210^2 + 156841^2 .

It is a cyclic number.

It is not a de Polignac number, because 25573163381 - 2² = 25573163377 is a prime.

It is a super-2 number, since 2×25573163381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25573163383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85815836 + ... + 85816133.

It is an arithmetic number, because the mean of its divisors is an integer number (6436198875).

Almost surely, 2^25573163381 is an apocalyptic number.

It is an amenable number.

25573163381 is a deficient number, since it is larger than the sum of its proper divisors (171632119).

25573163381 is a wasteful number, since it uses less digits than its factorization.

25573163381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171632118.

The product of its digits is 453600, while the sum is 44.

The spelling of 25573163381 in words is "twenty-five billion, five hundred seventy-three million, one hundred sixty-three thousand, three hundred eighty-one".