25645546542 has 32 divisors (see below), whose sum is σ = 63947337984. Its totient is φ = 6661180800.

The previous prime is 25645546541. The next prime is 25645546543. The reversal of 25645546542 is 24564554652.

It is an interprime number because it is at equal distance from previous prime (25645546541) and next prime (25645546543).

It is a junction number, because it is equal to n+sod(n) for n = 25645546491 and 25645546500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25645546541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27754459 + ... + 27755382.

It is an arithmetic number, because the mean of its divisors is an integer number (1998354312).

Almost surely, 2^25645546542 is an apocalyptic number.

25645546542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25645546542 is an abundant number, since it is smaller than the sum of its proper divisors (38301791442).

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

25645546542 is a wasteful number, since it uses less digits than its factorization.

25645546542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55509864.

The product of its digits is 5760000, while the sum is 48.

The spelling of 25645546542 in words is "twenty-five billion, six hundred forty-five million, five hundred forty-six thousand, five hundred forty-two".