25942419661 has 8 divisors (see below), whose sum is σ = 26323073280. Its totient is φ = 25563072912.

The previous prime is 25942419623. The next prime is 25942419697. The reversal of 25942419661 is 16691424952.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25942419661 - 2²¹ = 25940322509 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 (25942419761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286690 + ... + 366163.

It is an arithmetic number, because the mean of its divisors is an integer number (3290384160).

Almost surely, 2^25942419661 is an apocalyptic number.

It is an amenable number.

25942419661 is a deficient number, since it is larger than the sum of its proper divisors (380653619).

25942419661 is an equidigital number, since it uses as much as digits as its factorization.

25942419661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653435.

The product of its digits is 933120, while the sum is 49.

The spelling of 25942419661 in words is "twenty-five billion, nine hundred forty-two million, four hundred nineteen thousand, six hundred sixty-one".