25351720566 has 16 divisors (see below), whose sum is σ = 50818944000. Its totient is φ = 8431323048.

The previous prime is 25351720549. The next prime is 25351720567. The reversal of 25351720566 is 66502715352.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25351720567) 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 7 ways as a sum of consecutive naturals, for example, 4809766 + ... + 4815033.

It is an arithmetic number, because the mean of its divisors is an integer number (3176184000).

Almost surely, 2^25351720566 is an apocalyptic number.

25351720566 is an abundant number, since it is smaller than the sum of its proper divisors (25467223434).

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

25351720566 is a wasteful number, since it uses less digits than its factorization.

25351720566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9625243.

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 25351720566 in words is "twenty-five billion, three hundred fifty-one million, seven hundred twenty thousand, five hundred sixty-six".