642021260167 has 4 divisors (see below), whose sum is σ = 733738583056. Its totient is φ = 550303937280.

The previous prime is 642021260129. The next prime is 642021260197. The reversal of 642021260167 is 761062120246.

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 642021260167 - 2³⁵ = 607661521799 is a prime.

It is a super-3 number, since 3×642021260167³ (a number of 36 digits) contains 333 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 (642021260197) 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, 45858661434 + ... + 45858661447.

It is an arithmetic number, because the mean of its divisors is an integer number (183434645764).

Almost surely, 2^642021260167 is an apocalyptic number.

642021260167 is a deficient number, since it is larger than the sum of its proper divisors (91717322889).

642021260167 is an equidigital number, since it uses as much as digits as its factorization.

642021260167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91717322888.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 642021260167 in words is "six hundred forty-two billion, twenty-one million, two hundred sixty thousand, one hundred sixty-seven".