25667057661 has 8 divisors (see below), whose sum is σ = 39111706944. Its totient is φ = 14666890080.

The previous prime is 25667057659. The next prime is 25667057683. The reversal of 25667057661 is 16675076652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25667057661 - 2¹ = 25667057659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25667057641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611120400 + ... + 611120441.

It is an arithmetic number, because the mean of its divisors is an integer number (4888963368).

Almost surely, 2^25667057661 is an apocalyptic number.

25667057661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25667057661 is a deficient number, since it is larger than the sum of its proper divisors (13444649283).

25667057661 is a wasteful number, since it uses less digits than its factorization.

25667057661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222240851.

The product of its (nonzero) digits is 3175200, while the sum is 51.

The spelling of 25667057661 in words is "twenty-five billion, six hundred sixty-seven million, fifty-seven thousand, six hundred sixty-one".