673664551 has 16 divisors (see below), whose sum is σ = 814528000. Its totient is φ = 544265568.

The previous prime is 673664533. The next prime is 673664573. The reversal of 673664551 is 155466376.

It is not a de Polignac number, because 673664551 - 2¹¹ = 673662503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 673664498 and 673664507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673664351) 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, 13741 + ... + 39193.

It is an arithmetic number, because the mean of its divisors is an integer number (50908000).

Almost surely, 2^673664551 is an apocalyptic number.

673664551 is a deficient number, since it is larger than the sum of its proper divisors (140863449).

673664551 is a wasteful number, since it uses less digits than its factorization.

673664551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25678.

The product of its digits is 453600, while the sum is 43.

The square root of 673664551 is about 25955.0486610987. The cubic root of 673664551 is about 876.6264393023.

It can be divided in two parts, 67366 and 4551, that added together give a palindrome (71917).

The spelling of 673664551 in words is "six hundred seventy-three million, six hundred sixty-four thousand, five hundred fifty-one".