647945770845 has 16 divisors (see below), whose sum is σ = 1043578887552. Its totient is φ = 343282526400.

The previous prime is 647945770841. The next prime is 647945770897. The reversal of 647945770845 is 548077549746.

It is not a de Polignac number, because 647945770845 - 2² = 647945770841 is a prime.

It is a super-4 number, since 4×647945770845⁴ (a number of 48 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647945770841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143032122 + ... + 143036651.

It is an arithmetic number, because the mean of its divisors is an integer number (65223680472).

Almost surely, 2^647945770845 is an apocalyptic number.

It is an amenable number.

647945770845 is a deficient number, since it is larger than the sum of its proper divisors (395633116707).

647945770845 is a wasteful number, since it uses less digits than its factorization.

647945770845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286068932.

The product of its (nonzero) digits is 237081600, while the sum is 66.

The spelling of 647945770845 in words is "six hundred forty-seven billion, nine hundred forty-five million, seven hundred seventy thousand, eight hundred forty-five".