421846872779 has 2 divisors, whose sum is σ = 421846872780. Its totient is φ = 421846872778.

The previous prime is 421846872773. The next prime is 421846872833. The reversal of 421846872779 is 977278648124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421846872779 is a prime.

It is a super-2 number, since 2×421846872779² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421846872773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210923436389 + 210923436390.

It is an arithmetic number, because the mean of its divisors is an integer number (210923436390).

Almost surely, 2^421846872779 is an apocalyptic number.

421846872779 is a deficient number, since it is larger than the sum of its proper divisors (1).

421846872779 is an equidigital number, since it uses as much as digits as its factorization.

421846872779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75866112, while the sum is 65.

The spelling of 421846872779 in words is "four hundred twenty-one billion, eight hundred forty-six million, eight hundred seventy-two thousand, seven hundred seventy-nine".