25400433661 has 4 divisors (see below), whose sum is σ = 25401356352. Its totient is φ = 25399510972.

The previous prime is 25400433649. The next prime is 25400433701. The reversal of 25400433661 is 16633400452.

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 a cyclic number.

It is not a de Polignac number, because 25400433661 - 2²⁹ = 24863562749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400433361) 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, 418741 + ... + 475546.

It is an arithmetic number, because the mean of its divisors is an integer number (6350339088).

Almost surely, 2^25400433661 is an apocalyptic number.

It is an amenable number.

25400433661 is a deficient number, since it is larger than the sum of its proper divisors (922691).

25400433661 is an equidigital number, since it uses as much as digits as its factorization.

25400433661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922690.

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 25400433661 in words is "twenty-five billion, four hundred million, four hundred thirty-three thousand, six hundred sixty-one".