646131926267 has 4 divisors (see below), whose sum is σ = 646133808480. Its totient is φ = 646130044056.

The previous prime is 646131926243. The next prime is 646131926303. The reversal of 646131926267 is 762629131646.

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 646131926267 - 2¹² = 646131922171 is a prime.

It is a super-2 number, since 2×646131926267² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646131920267) 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, 263603 + ... + 1166940.

It is an arithmetic number, because the mean of its divisors is an integer number (161533452120).

Almost surely, 2^646131926267 is an apocalyptic number.

646131926267 is a deficient number, since it is larger than the sum of its proper divisors (1882213).

646131926267 is a wasteful number, since it uses less digits than its factorization.

646131926267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882212.

The product of its digits is 3919104, while the sum is 53.

The spelling of 646131926267 in words is "six hundred forty-six billion, one hundred thirty-one million, nine hundred twenty-six thousand, two hundred sixty-seven".