642492683769 has 4 divisors (see below), whose sum is σ = 856656911696. Its totient is φ = 428328455844.

The previous prime is 642492683737. The next prime is 642492683839. The reversal of 642492683769 is 967386294246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642492683769 - 2⁵ = 642492683737 is a prime.

It is a super-2 number, since 2×642492683769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642492483769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107082113959 + ... + 107082113964.

It is an arithmetic number, because the mean of its divisors is an integer number (214164227924).

Almost surely, 2^642492683769 is an apocalyptic number.

It is an amenable number.

642492683769 is a deficient number, since it is larger than the sum of its proper divisors (214164227927).

642492683769 is a wasteful number, since it uses less digits than its factorization.

642492683769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214164227926.

The product of its digits is 188116992, while the sum is 66.

The spelling of 642492683769 in words is "six hundred forty-two billion, four hundred ninety-two million, six hundred eighty-three thousand, seven hundred sixty-nine".