642772172767 has 2 divisors, whose sum is σ = 642772172768. Its totient is φ = 642772172766.

The previous prime is 642772172737. The next prime is 642772172837. The reversal of 642772172767 is 767271277246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642772172767 is a prime.

It is a super-2 number, since 2×642772172767² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642772172737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321386086383 + 321386086384.

It is an arithmetic number, because the mean of its divisors is an integer number (321386086384).

Almost surely, 2^642772172767 is an apocalyptic number.

642772172767 is a deficient number, since it is larger than the sum of its proper divisors (1).

642772172767 is an equidigital number, since it uses as much as digits as its factorization.

642772172767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19361664, while the sum is 58.

The spelling of 642772172767 in words is "six hundred forty-two billion, seven hundred seventy-two million, one hundred seventy-two thousand, seven hundred sixty-seven".