855722400642 has 30 divisors (see below), whose sum is σ = 1917478428723. Its totient is φ = 285236875548.

The previous prime is 855722400601. The next prime is 855722400647. The reversal of 855722400642 is 246004227558.

855722400642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 427861200321 + 427861200321 = 654111^2 + 654111^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=654111.

It is not an unprimeable number, because it can be changed into a prime (855722400647) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 11737659 + ... + 11810337.

Almost surely, 2^855722400642 is an apocalyptic number.

855722400642 is an abundant number, since it is smaller than the sum of its proper divisors (1061756028081).

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

855722400642 is an frugal number, since it uses more digits than its factorization.

855722400642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145372 (or 72684 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 45.

The spelling of 855722400642 in words is "eight hundred fifty-five billion, seven hundred twenty-two million, four hundred thousand, six hundred forty-two".