25278465371 has 4 divisors (see below), whose sum is σ = 25353475992. Its totient is φ = 25203454752.

The previous prime is 25278465361. The next prime is 25278465449. The reversal of 25278465371 is 17356487252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25278465371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25278465361) 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, 37504805 + ... + 37505478.

It is an arithmetic number, because the mean of its divisors is an integer number (6338368998).

Almost surely, 2^25278465371 is an apocalyptic number.

25278465371 is a deficient number, since it is larger than the sum of its proper divisors (75010621).

25278465371 is an equidigital number, since it uses as much as digits as its factorization.

25278465371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75010620.

The product of its digits is 2822400, while the sum is 50.

The spelling of 25278465371 in words is "twenty-five billion, two hundred seventy-eight million, four hundred sixty-five thousand, three hundred seventy-one".