25551063409 has 27 divisors (see below), whose sum is σ = 27707385657. Its totient is φ = 23558890248.

The previous prime is 25551063383. The next prime is 25551063493. The reversal of 25551063409 is 90436015552.

The square root of 25551063409 is 159847.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 25551063409 - 2⁹ = 25551062897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25551063809) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 142743282 + ... + 142743460.

Almost surely, 2^25551063409 is an apocalyptic number.

25551063409 is the 159847-th square number.

25551063409 is the 79924-th centered octagonal number.

It is an amenable number.

25551063409 is a deficient number, since it is larger than the sum of its proper divisors (2156322248).

25551063409 is an frugal number, since it uses more digits than its factorization.

25551063409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 25551063409 in words is "twenty-five billion, five hundred fifty-one million, sixty-three thousand, four hundred nine".