642254711522 has 6 divisors (see below), whose sum is σ = 963383767329. Its totient is φ = 321126789080.

The previous prime is 642254711513. The next prime is 642254711557. The reversal of 642254711522 is 225117452246.

It can be written as a sum of positive squares in 2 ways, for example, as 449209593361 + 193045118161 = 670231^2 + 439369^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=566681.

It is a super-2 number, since 2×642254711522² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642254711522.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 850022 + ... + 1416702.

Almost surely, 2^642254711522 is an apocalyptic number.

642254711522 is a deficient number, since it is larger than the sum of its proper divisors (321129055807).

642254711522 is an frugal number, since it uses more digits than its factorization.

642254711522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133364 (or 566683 counting only the distinct ones).

The product of its digits is 268800, while the sum is 41.

The spelling of 642254711522 in words is "six hundred forty-two billion, two hundred fifty-four million, seven hundred eleven thousand, five hundred twenty-two".