647663753 has 6 divisors (see below), whose sum is σ = 711895002. Its totient is φ = 588785120.

The previous prime is 647663747. The next prime is 647663759. The reversal of 647663753 is 357366746.

It is an interprime number because it is at equal distance from previous prime (647663747) and next prime (647663759).

It can be written as a sum of positive squares in only one way, i.e., 633428224 + 14235529 = 25168^2 + 3773^2 .

It is not a de Polignac number, because 647663753 - 2¹⁸ = 647401609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647663698 and 647663707.

It is not an unprimeable number, because it can be changed into a prime (647663759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2676176 + ... + 2676417.

It is an arithmetic number, because the mean of its divisors is an integer number (118649167).

Almost surely, 2^647663753 is an apocalyptic number.

It is an amenable number.

647663753 is a deficient number, since it is larger than the sum of its proper divisors (64231249).

647663753 is a wasteful number, since it uses less digits than its factorization.

647663753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352615 (or 5352604 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 47.

The square root of 647663753 is about 25449.2387508939. The cubic root of 647663753 is about 865.2000397166.

The spelling of 647663753 in words is "six hundred forty-seven million, six hundred sixty-three thousand, seven hundred fifty-three".