642350626111 has 4 divisors (see below), whose sum is σ = 642352233424. Its totient is φ = 642349018800.

The previous prime is 642350626097. The next prime is 642350626219. The reversal of 642350626111 is 111626053246.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 642350626111 - 2²³ = 642342237503 is a prime.

It is a super-2 number, since 2×642350626111² (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 (642350606111) 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, 312931 + ... + 1175851.

It is an arithmetic number, because the mean of its divisors is an integer number (160588058356).

Almost surely, 2^642350626111 is an apocalyptic number.

642350626111 is a deficient number, since it is larger than the sum of its proper divisors (1607313).

642350626111 is an equidigital number, since it uses as much as digits as its factorization.

642350626111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607312.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 642350626111 its reverse (111626053246), we get a palindrome (753976679357).

The spelling of 642350626111 in words is "six hundred forty-two billion, three hundred fifty million, six hundred twenty-six thousand, one hundred eleven".