25556778575845 has 32 divisors (see below), whose sum is σ = 35217542592000. Its totient is φ = 17608225020480.

The previous prime is 25556778575803. The next prime is 25556778575899. The reversal of 25556778575845 is 54857587765552.

It is not a de Polignac number, because 25556778575845 - 2¹⁷ = 25556778444773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85895746 + ... + 86192764.

It is an arithmetic number, because the mean of its divisors is an integer number (1100548206000).

Almost surely, 2^{25556778575845} is an apocalyptic number.

It is an amenable number.

25556778575845 is a deficient number, since it is larger than the sum of its proper divisors (9660764016155).

25556778575845 is a wasteful number, since it uses less digits than its factorization.

25556778575845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379393.

The product of its digits is 16464000000, while the sum is 79.

The spelling of 25556778575845 in words is "twenty-five trillion, five hundred fifty-six billion, seven hundred seventy-eight million, five hundred seventy-five thousand, eight hundred forty-five".