642914868847 has 4 divisors (see below), whose sum is σ = 643257028720. Its totient is φ = 642572708976.

The previous prime is 642914868839. The next prime is 642914868853. The reversal of 642914868847 is 748868419246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748868419246 = 2 ⋅374434209623.

It is a cyclic number.

It is not a de Polignac number, because 642914868847 - 2³ = 642914868839 is a prime.

It is a super-2 number, since 2×642914868847² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642914868047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171077118 + ... + 171080875.

It is an arithmetic number, because the mean of its divisors is an integer number (160814257180).

Almost surely, 2^642914868847 is an apocalyptic number.

642914868847 is a deficient number, since it is larger than the sum of its proper divisors (342159873).

642914868847 is a wasteful number, since it uses less digits than its factorization.

642914868847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342159872.

The product of its digits is 148635648, while the sum is 67.

The spelling of 642914868847 in words is "six hundred forty-two billion, nine hundred fourteen million, eight hundred sixty-eight thousand, eight hundred forty-seven".