25457999490 has 1008 divisors, whose sum is σ = 95455100160. Its totient is φ = 4849891200.

The previous prime is 25457999423. The next prime is 25457999507. The reversal of 25457999490 is 9499975452.

25457999490 is a `hidden beast` number, since 2 + 5 + 4 + 57 + 9 + 99 + 490 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 503 ways as a sum of consecutive naturals, for example, 821225775 + ... + 821225805.

It is an arithmetic number, because the mean of its divisors is an integer number (94697520).

Almost surely, 2^25457999490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25457999490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47727550080).

25457999490 is an abundant number, since it is smaller than the sum of its proper divisors (69997100670).

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

25457999490 is a wasteful number, since it uses less digits than its factorization.

25457999490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 63.

The spelling of 25457999490 in words is "twenty-five billion, four hundred fifty-seven million, nine hundred ninety-nine thousand, four hundred ninety".