623645645347 has 4 divisors (see below), whose sum is σ = 626233386856. Its totient is φ = 621057903840.

The previous prime is 623645645327. The next prime is 623645645417. The reversal of 623645645347 is 743546546326.

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 623645645347 - 2¹⁹ = 623645121059 is a prime.

It is a super-2 number, since 2×623645645347² (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 (623645645327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1293870393 + ... + 1293870874.

It is an arithmetic number, because the mean of its divisors is an integer number (156558346714).

Almost surely, 2^623645645347 is an apocalyptic number.

623645645347 is a deficient number, since it is larger than the sum of its proper divisors (2587741509).

623645645347 is a wasteful number, since it uses less digits than its factorization.

623645645347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587741508.

The product of its digits is 43545600, while the sum is 55.

The spelling of 623645645347 in words is "six hundred twenty-three billion, six hundred forty-five million, six hundred forty-five thousand, three hundred forty-seven".