25564136514 has 32 divisors (see below), whose sum is σ = 58824489600. Its totient is φ = 7255016832.

The previous prime is 25564136513. The next prime is 25564136519. The reversal of 25564136514 is 41563146552.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (25564136513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2036259 + ... + 2048774.

It is an arithmetic number, because the mean of its divisors is an integer number (1838265300).

Almost surely, 2^25564136514 is an apocalyptic number.

25564136514 is an abundant number, since it is smaller than the sum of its proper divisors (33260353086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25564136514 is a wasteful number, since it uses less digits than its factorization.

25564136514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085194.

The product of its digits is 432000, while the sum is 42.

The spelling of 25564136514 in words is "twenty-five billion, five hundred sixty-four million, one hundred thirty-six thousand, five hundred fourteen".