25978498650 has 288 divisors, whose sum is σ = 76678842240. Its totient is φ = 6267456000.

The previous prime is 25978498607. The next prime is 25978498661. The reversal of 25978498650 is 5689487952.

25978498650 is a `hidden beast` number, since 2 + 5 + 97 + 8 + 498 + 6 + 50 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 83531995 + ... + 83532305.

It is an arithmetic number, because the mean of its divisors is an integer number (266245980).

Almost surely, 2^25978498650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25978498650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38339421120).

25978498650 is an abundant number, since it is smaller than the sum of its proper divisors (50700343590).

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

25978498650 is a wasteful number, since it uses less digits than its factorization.

25978498650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 25978498650 in words is "twenty-five billion, nine hundred seventy-eight million, four hundred ninety-eight thousand, six hundred fifty".