646229631347 has 4 divisors (see below), whose sum is σ = 646231300440. Its totient is φ = 646227962256.

The previous prime is 646229631287. The next prime is 646229631401. The reversal of 646229631347 is 743136922646.

646229631347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 646229631347 - 2²² = 646225437043 is a prime.

It is a super-2 number, since 2×646229631347² (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 (646229681347) 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, 81068 + ... + 1139750.

It is an arithmetic number, because the mean of its divisors is an integer number (161557825110).

Almost surely, 2^646229631347 is an apocalyptic number.

646229631347 is a deficient number, since it is larger than the sum of its proper divisors (1669093).

646229631347 is a wasteful number, since it uses less digits than its factorization.

646229631347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669092.

The product of its digits is 7838208, while the sum is 53.

It can be divided in two parts, 64622 and 9631347, that added together give a palindrome (9695969).

The spelling of 646229631347 in words is "six hundred forty-six billion, two hundred twenty-nine million, six hundred thirty-one thousand, three hundred forty-seven".