642695854227 has 12 divisors (see below), whose sum is σ = 996834386376. Its totient is φ = 367254773760.

The previous prime is 642695854217. The next prime is 642695854231. The reversal of 642695854227 is 722458596246.

It is not a de Polignac number, because 642695854227 - 2¹⁴ = 642695837843 is a prime.

It is a super-2 number, since 2×642695854227² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642695854217) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2186040174 + ... + 2186040467.

It is an arithmetic number, because the mean of its divisors is an integer number (83069532198).

Almost surely, 2^642695854227 is an apocalyptic number.

642695854227 is a deficient number, since it is larger than the sum of its proper divisors (354138532149).

642695854227 is a wasteful number, since it uses less digits than its factorization.

642695854227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4372080658 (or 4372080651 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 60.

The spelling of 642695854227 in words is "six hundred forty-two billion, six hundred ninety-five million, eight hundred fifty-four thousand, two hundred twenty-seven".