25677769381 has 4 divisors (see below), whose sum is σ = 28012112064. Its totient is φ = 23343426700.

The previous prime is 25677769291. The next prime is 25677769387. The reversal of 25677769381 is 18396777652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25677769381 - 2⁹ = 25677768869 is a prime.

It is a super-2 number, since 2×25677769381² (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 (25677769387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1167171325 + ... + 1167171346.

It is an arithmetic number, because the mean of its divisors is an integer number (7003028016).

Almost surely, 2^25677769381 is an apocalyptic number.

It is an amenable number.

25677769381 is a deficient number, since it is larger than the sum of its proper divisors (2334342683).

25677769381 is a wasteful number, since it uses less digits than its factorization.

25677769381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334342682.

The product of its digits is 26671680, while the sum is 61.

The spelling of 25677769381 in words is "twenty-five billion, six hundred seventy-seven million, seven hundred sixty-nine thousand, three hundred eighty-one".