646719177469 has 24 divisors (see below), whose sum is σ = 710097631200. Its totient is φ = 588550183680.

The previous prime is 646719177457. The next prime is 646719177509. The reversal of 646719177469 is 964771917646.

It is not a de Polignac number, because 646719177469 - 2⁵ = 646719177437 is a prime.

It is a super-2 number, since 2×646719177469² (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 (646719177869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 729222 + ... + 1351000.

It is an arithmetic number, because the mean of its divisors is an integer number (29587401300).

Almost surely, 2^646719177469 is an apocalyptic number.

It is an amenable number.

646719177469 is a deficient number, since it is larger than the sum of its proper divisors (63378453731).

646719177469 is a wasteful number, since it uses less digits than its factorization.

646719177469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621933 (or 621916 counting only the distinct ones).

The product of its digits is 96018048, while the sum is 67.

The spelling of 646719177469 in words is "six hundred forty-six billion, seven hundred nineteen million, one hundred seventy-seven thousand, four hundred sixty-nine".