25721007171572 has 12 divisors (see below), whose sum is σ = 45055935042720. Its totient is φ = 12847882873656.

The previous prime is 25721007171499. The next prime is 25721007171577. The reversal of 25721007171572 is 27517170012752.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25721007171577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3155173448 + ... + 3155181599.

It is an arithmetic number, because the mean of its divisors is an integer number (3754661253560).

Almost surely, 2^{25721007171572} is an apocalyptic number.

It is an amenable number.

25721007171572 is a deficient number, since it is larger than the sum of its proper divisors (19334927871148).

25721007171572 is a wasteful number, since it uses less digits than its factorization.

25721007171572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6310356070 (or 6310356068 counting only the distinct ones).

The product of its (nonzero) digits is 480200, while the sum is 47.

The spelling of 25721007171572 in words is "twenty-five trillion, seven hundred twenty-one billion, seven million, one hundred seventy-one thousand, five hundred seventy-two".