25564743405 has 24 divisors (see below), whose sum is σ = 44507447712. Its totient is φ = 13574460384.

The previous prime is 25564743383. The next prime is 25564743461. The reversal of 25564743405 is 50434746552.

25564743405 is a `hidden beast` number, since 2 + 5 + 564 + 7 + 43 + 40 + 5 = 666.

It is not a de Polignac number, because 25564743405 - 2⁶ = 25564743341 is a prime.

It is a super-2 number, since 2×25564743405² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1241119 + ... + 1261548.

It is an arithmetic number, because the mean of its divisors is an integer number (1854476988).

Almost surely, 2^25564743405 is an apocalyptic number.

It is an amenable number.

25564743405 is a deficient number, since it is larger than the sum of its proper divisors (18942704307).

25564743405 is a wasteful number, since it uses less digits than its factorization.

25564743405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502905 (or 2502902 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 45.

The spelling of 25564743405 in words is "twenty-five billion, five hundred sixty-four million, seven hundred forty-three thousand, four hundred five".