642776381383 has 2 divisors, whose sum is σ = 642776381384. Its totient is φ = 642776381382.

The previous prime is 642776381381. The next prime is 642776381399. The reversal of 642776381383 is 383183677246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642776381383 - 2¹ = 642776381381 is a prime.

It is a super-2 number, since 2×642776381383² (a number of 24 digits) contains 22 as substring.

Together with 642776381381, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642776381381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321388190691 + 321388190692.

It is an arithmetic number, because the mean of its divisors is an integer number (321388190692).

Almost surely, 2^642776381383 is an apocalyptic number.

642776381383 is a deficient number, since it is larger than the sum of its proper divisors (1).

642776381383 is an equidigital number, since it uses as much as digits as its factorization.

642776381383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24385536, while the sum is 58.

The spelling of 642776381383 in words is "six hundred forty-two billion, seven hundred seventy-six million, three hundred eighty-one thousand, three hundred eighty-three".