25275502778 has 8 divisors (see below), whose sum is σ = 37953547380. Its totient is φ = 12624320320.

The previous prime is 25275502771. The next prime is 25275502781. The reversal of 25275502778 is 87720557252.

It can be written as a sum of positive squares in 2 ways, for example, as 21970057729 + 3305445049 = 148223^2 + 57493^2 .

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

It is not an unprimeable number, because it can be changed into a prime (25275502771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6713183 + ... + 6716946.

Almost surely, 2^25275502778 is an apocalyptic number.

25275502778 is a deficient number, since it is larger than the sum of its proper divisors (12678044602).

25275502778 is a wasteful number, since it uses less digits than its factorization.

25275502778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13431072.

The product of its (nonzero) digits is 2744000, while the sum is 50.

The spelling of 25275502778 in words is "twenty-five billion, two hundred seventy-five million, five hundred two thousand, seven hundred seventy-eight".