25535543642 has 16 divisors (see below), whose sum is σ = 43809156672. Its totient is φ = 10935319680.

The previous prime is 25535543641. The next prime is 25535543647. The reversal of 25535543642 is 24634553552.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 25535543593 and 25535543602.

It is not an unprimeable number, because it can be changed into a prime (25535543641) 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, 688343 + ... + 724490.

It is an arithmetic number, because the mean of its divisors is an integer number (2738072292).

Almost surely, 2^25535543642 is an apocalyptic number.

25535543642 is a deficient number, since it is larger than the sum of its proper divisors (18273613030).

25535543642 is a wasteful number, since it uses less digits than its factorization.

25535543642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414133.

The product of its digits is 2160000, while the sum is 44.

The spelling of 25535543642 in words is "twenty-five billion, five hundred thirty-five million, five hundred forty-three thousand, six hundred forty-two".