647245631345 has 4 divisors (see below), whose sum is σ = 776694757620. Its totient is φ = 517796505072.

The previous prime is 647245631339. The next prime is 647245631359. The reversal of 647245631345 is 543136542746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 226620746209 + 420624885136 = 476047^2 + 648556^2 .

It is a cyclic number.

It is not a de Polignac number, because 647245631345 - 2¹⁰ = 647245630321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647245631293 and 647245631302.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64724563130 + ... + 64724563139.

It is an arithmetic number, because the mean of its divisors is an integer number (194173689405).

Almost surely, 2^647245631345 is an apocalyptic number.

It is an amenable number.

647245631345 is a deficient number, since it is larger than the sum of its proper divisors (129449126275).

647245631345 is a wasteful number, since it uses less digits than its factorization.

647245631345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129449126274.

The product of its digits is 7257600, while the sum is 50.

The spelling of 647245631345 in words is "six hundred forty-seven billion, two hundred forty-five million, six hundred thirty-one thousand, three hundred forty-five".