25645621486 has 16 divisors (see below), whose sum is σ = 39646252800. Its totient is φ = 12434494968.

The previous prime is 25645621481. The next prime is 25645621511. The reversal of 25645621486 is 68412654652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25645621481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060726 + ... + 1084633.

It is an arithmetic number, because the mean of its divisors is an integer number (2477890800).

Almost surely, 2^25645621486 is an apocalyptic number.

25645621486 is a deficient number, since it is larger than the sum of its proper divisors (14000631314).

25645621486 is a wasteful number, since it uses less digits than its factorization.

25645621486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145543.

The product of its digits is 2764800, while the sum is 49.

The spelling of 25645621486 in words is "twenty-five billion, six hundred forty-five million, six hundred twenty-one thousand, four hundred eighty-six".