25005550278 has 16 divisors (see below), whose sum is σ = 50310570240. Its totient is φ = 8285271816.

The previous prime is 25005550249. The next prime is 25005550289. The reversal of 25005550278 is 87205550052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12476818 + ... + 12478821.

It is an arithmetic number, because the mean of its divisors is an integer number (3144410640).

Almost surely, 2^25005550278 is an apocalyptic number.

25005550278 is an abundant number, since it is smaller than the sum of its proper divisors (25305019962).

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

25005550278 is a wasteful number, since it uses less digits than its factorization.

25005550278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24955811.

The product of its (nonzero) digits is 140000, while the sum is 39.

It can be divided in two parts, 2500 and 5550278, that added together give a triangular number (5552778 = T₃₃₃₂).

The spelling of 25005550278 in words is "twenty-five billion, five million, five hundred fifty thousand, two hundred seventy-eight".