642557404755246 has 16 divisors (see below), whose sum is σ = 1285116431359824. Its totient is φ = 214185531276864.

The previous prime is 642557404755197. The next prime is 642557404755289.

642557404755246 is nontrivially palindromic in base 10.

It is a congruent number.

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, 62396055 + ... + 71960978.

It is an arithmetic number, because the mean of its divisors is an integer number (80319776959989).

Almost surely, 2^{642557404755246} is an apocalyptic number.

642557404755246 is an abundant number, since it is smaller than the sum of its proper divisors (642559026604578).

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

642557404755246 is a wasteful number, since it uses less digits than its factorization.

642557404755246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135154115.

The product of its (nonzero) digits is 1128960000, while the sum is 66.

The spelling of 642557404755246 in words is "six hundred forty-two trillion, five hundred fifty-seven billion, four hundred four million, seven hundred fifty-five thousand, two hundred forty-six".