25505491426 has 4 divisors (see below), whose sum is σ = 38258237142. Its totient is φ = 12752745712.

The previous prime is 25505491399. The next prime is 25505491463. The reversal of 25505491426 is 62419450552.

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

It can be written as a sum of positive squares in only one way, i.e., 23949110025 + 1556381401 = 154755^2 + 39451^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6376372855 + ... + 6376372858.

Almost surely, 2^25505491426 is an apocalyptic number.

25505491426 is a deficient number, since it is larger than the sum of its proper divisors (12752745716).

25505491426 is a wasteful number, since it uses less digits than its factorization.

25505491426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12752745715.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 25505491426 in words is "twenty-five billion, five hundred five million, four hundred ninety-one thousand, four hundred twenty-six".