642770523576 has 128 divisors (see below), whose sum is σ = 1800552326400. Its totient is φ = 212453055360.

The previous prime is 642770523557. The next prime is 642770523601. The reversal of 642770523576 is 675325077246.

It is a happy number.

642770523576 is a `hidden beast` number, since 6 + 42 + 7 + 7 + 0 + 5 + 23 + 576 = 666.

642770523576 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16631491 + ... + 16670093.

It is an arithmetic number, because the mean of its divisors is an integer number (14066815050).

Almost surely, 2^642770523576 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642770523576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900276163200).

642770523576 is an abundant number, since it is smaller than the sum of its proper divisors (1157781802824).

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

642770523576 is a wasteful number, since it uses less digits than its factorization.

642770523576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39266 (or 39256 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 54.

The spelling of 642770523576 in words is "six hundred forty-two billion, seven hundred seventy million, five hundred twenty-three thousand, five hundred seventy-six".