25807206642 has 16 divisors (see below), whose sum is σ = 58987900992. Its totient is φ = 7373487600.

The previous prime is 25807206619. The next prime is 25807206661. The reversal of 25807206642 is 24660270852.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 614457301 = 25807206642 / (2 + 5 + 8 + 0 + 7 + 2 + 0 + 6 + 6 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 25807206594 and 25807206603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307228609 + ... + 307228692.

It is an arithmetic number, because the mean of its divisors is an integer number (3686743812).

Almost surely, 2^25807206642 is an apocalyptic number.

25807206642 is an abundant number, since it is smaller than the sum of its proper divisors (33180694350).

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

25807206642 is a wasteful number, since it uses less digits than its factorization.

25807206642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614457313.

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 25807206642 in words is "twenty-five billion, eight hundred seven million, two hundred six thousand, six hundred forty-two".