25685416661 has 8 divisors (see below), whose sum is σ = 25933340160. Its totient is φ = 25437639168.

The previous prime is 25685416649. The next prime is 25685416663. The reversal of 25685416661 is 16661458652.

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 a de Polignac number, because none of the positive numbers 2^k-25685416661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25685416663) 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, 335180 + ... + 404618.

It is an arithmetic number, because the mean of its divisors is an integer number (3241667520).

Almost surely, 2^25685416661 is an apocalyptic number.

It is an amenable number.

25685416661 is a deficient number, since it is larger than the sum of its proper divisors (247923499).

25685416661 is a wasteful number, since it uses less digits than its factorization.

25685416661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73003.

The product of its digits is 2073600, while the sum is 50.

The spelling of 25685416661 in words is "twenty-five billion, six hundred eighty-five million, four hundred sixteen thousand, six hundred sixty-one".