642727644305 has 32 divisors (see below), whose sum is σ = 797833183104. Its totient is φ = 496777222656.

The previous prime is 642727644271. The next prime is 642727644319. The reversal of 642727644305 is 503446727246.

It is a cyclic number.

It is not a de Polignac number, because 642727644305 - 2⁶ = 642727644241 is a prime.

It is a Duffinian 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, 77460917 + ... + 77469213.

It is an arithmetic number, because the mean of its divisors is an integer number (24932286972).

Almost surely, 2^642727644305 is an apocalyptic number.

It is an amenable number.

642727644305 is a deficient number, since it is larger than the sum of its proper divisors (155105538799).

642727644305 is a wasteful number, since it uses less digits than its factorization.

642727644305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12785.

The product of its (nonzero) digits is 6773760, while the sum is 50.

The spelling of 642727644305 in words is "six hundred forty-two billion, seven hundred twenty-seven million, six hundred forty-four thousand, three hundred five".