25645781457989 has 24 divisors (see below), whose sum is σ = 33338703577536. Its totient is φ = 19496317848000.

The previous prime is 25645781457931. The next prime is 25645781458001. The reversal of 25645781457989 is 98975418754652.

It is a happy number.

It is not a de Polignac number, because 25645781457989 - 2²⁸ = 25645513022533 is a prime.

It is a super-2 number, since 2×25645781457989² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25645721457989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 580225457 + ... + 580269654.

It is an arithmetic number, because the mean of its divisors is an integer number (1389112649064).

Almost surely, 2^{25645781457989} is an apocalyptic number.

It is an amenable number.

25645781457989 is a deficient number, since it is larger than the sum of its proper divisors (7692922119547).

25645781457989 is a wasteful number, since it uses less digits than its factorization.

25645781457989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160495177 (or 1160495170 counting only the distinct ones).

The product of its digits is 6096384000, while the sum is 80.

The spelling of 25645781457989 in words is "twenty-five trillion, six hundred forty-five billion, seven hundred eighty-one million, four hundred fifty-seven thousand, nine hundred eighty-nine".