642213372646 has 4 divisors (see below), whose sum is σ = 963320058972. Its totient is φ = 321106686322.

The previous prime is 642213372641. The next prime is 642213372733. The reversal of 642213372646 is 646273312246.

642213372646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×642213372646² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642213372596 and 642213372605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642213372641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160553343160 + ... + 160553343163.

It is an arithmetic number, because the mean of its divisors is an integer number (240830014743).

Almost surely, 2^642213372646 is an apocalyptic number.

642213372646 is a deficient number, since it is larger than the sum of its proper divisors (321106686326).

642213372646 is a wasteful number, since it uses less digits than its factorization.

642213372646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321106686325.

The product of its digits is 1741824, while the sum is 46.

The spelling of 642213372646 in words is "six hundred forty-two billion, two hundred thirteen million, three hundred seventy-two thousand, six hundred forty-six".