25682090978 has 8 divisors (see below), whose sum is σ = 40789203372. Its totient is φ = 12085689856.

The previous prime is 25682090969. The next prime is 25682091011. The reversal of 25682090978 is 87909028652.

It can be written as a sum of positive squares in 2 ways, for example, as 24488181169 + 1193909809 = 156487^2 + 34553^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377677775 + ... + 377677842.

Almost surely, 2^25682090978 is an apocalyptic number.

25682090978 is a deficient number, since it is larger than the sum of its proper divisors (15107112394).

25682090978 is a wasteful number, since it uses less digits than its factorization.

25682090978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755355636.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 25682090978 in words is "twenty-five billion, six hundred eighty-two million, ninety thousand, nine hundred seventy-eight".