25990666492 has 18 divisors (see below), whose sum is σ = 51983039192. Its totient is φ = 11138491464.

The previous prime is 25990666487. The next prime is 25990666519. The reversal of 25990666492 is 29466609952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 837843 + ... + 868309.

Almost surely, 2^25990666492 is an apocalyptic number.

It is an amenable number.

25990666492 is an abundant number, since it is smaller than the sum of its proper divisors (25992372700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25990666492 is an frugal number, since it uses more digits than its factorization.

25990666492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60945 (or 30476 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 58.

The spelling of 25990666492 in words is "twenty-five billion, nine hundred ninety million, six hundred sixty-six thousand, four hundred ninety-two".