25130644478 has 4 divisors (see below), whose sum is σ = 37695966720. Its totient is φ = 12565322238.

The previous prime is 25130644393. The next prime is 25130644489. The reversal of 25130644478 is 87444603152.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282661118 + ... + 6282661121.

It is an arithmetic number, because the mean of its divisors is an integer number (9423991680).

Almost surely, 2^25130644478 is an apocalyptic number.

25130644478 is a deficient number, since it is larger than the sum of its proper divisors (12565322242).

25130644478 is a wasteful number, since it uses less digits than its factorization.

25130644478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12565322241.

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 25130644478 in words is "twenty-five billion, one hundred thirty million, six hundred forty-four thousand, four hundred seventy-eight".