25578787073 has 4 divisors (see below), whose sum is σ = 29232899520. Its totient is φ = 21924674628.

The previous prime is 25578787051. The next prime is 25578787079. The reversal of 25578787073 is 37078787552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25578787073 - 2²⁶ = 25511678209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25578787079) 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, 1827056213 + ... + 1827056226.

It is an arithmetic number, because the mean of its divisors is an integer number (7308224880).

Almost surely, 2^25578787073 is an apocalyptic number.

It is an amenable number.

25578787073 is a deficient number, since it is larger than the sum of its proper divisors (3654112447).

25578787073 is an equidigital number, since it uses as much as digits as its factorization.

25578787073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654112446.

The product of its (nonzero) digits is 23049600, while the sum is 59.

The spelling of 25578787073 in words is "twenty-five billion, five hundred seventy-eight million, seven hundred eighty-seven thousand, seventy-three".