646462617767 has 4 divisors (see below), whose sum is σ = 646482496920. Its totient is φ = 646442738616.

The previous prime is 646462617601. The next prime is 646462617793. The reversal of 646462617767 is 767716264646.

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 646462617767 - 2⁸ = 646462617511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646462617067) 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, 9890717 + ... + 9955862.

It is an arithmetic number, because the mean of its divisors is an integer number (161620624230).

Almost surely, 2^646462617767 is an apocalyptic number.

646462617767 is a deficient number, since it is larger than the sum of its proper divisors (19879153).

646462617767 is a wasteful number, since it uses less digits than its factorization.

646462617767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19879152.

The product of its digits is 85349376, while the sum is 62.

The spelling of 646462617767 in words is "six hundred forty-six billion, four hundred sixty-two million, six hundred seventeen thousand, seven hundred sixty-seven".