6647601623 has 4 divisors (see below), whose sum is σ = 7158955608. Its totient is φ = 6136247640.

The previous prime is 6647601619. The next prime is 6647601643. The reversal of 6647601623 is 3261067466.

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 6647601623 - 2² = 6647601619 is a prime.

It is a super-2 number, since 2×6647601623² = 88381214676224468258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6647601643) 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, 255676973 + ... + 255676998.

It is an arithmetic number, because the mean of its divisors is an integer number (1789738902).

Almost surely, 2^6647601623 is an apocalyptic number.

6647601623 is a deficient number, since it is larger than the sum of its proper divisors (511353985).

6647601623 is a wasteful number, since it uses less digits than its factorization.

6647601623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511353984.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 6647601623 is about 81532.8254324600. The cubic root of 6647601623 is about 1880.2762555220.

The spelling of 6647601623 in words is "six billion, six hundred forty-seven million, six hundred one thousand, six hundred twenty-three".