1642279543859 has 4 divisors (see below), whose sum is σ = 1659210260904. Its totient is φ = 1625348826816.

The previous prime is 1642279543847. The next prime is 1642279543897. The reversal of 1642279543859 is 9583459722461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642279543859 - 2²⁸ = 1642011108403 is a prime.

It is a super-2 number, since 2×1642279543859² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1642279543795 and 1642279543804.

It is not an unprimeable number, because it can be changed into a prime (1642279543159) 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, 8465358377 + ... + 8465358570.

It is an arithmetic number, because the mean of its divisors is an integer number (414802565226).

Almost surely, 2^{1642279543859} is an apocalyptic number.

1642279543859 is a deficient number, since it is larger than the sum of its proper divisors (16930717045).

1642279543859 is an equidigital number, since it uses as much as digits as its factorization.

1642279543859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16930717044.

The product of its digits is 130636800, while the sum is 65.

The spelling of 1642279543859 in words is "one trillion, six hundred forty-two billion, two hundred seventy-nine million, five hundred forty-three thousand, eight hundred fifty-nine".