673840665523 has 8 divisors (see below), whose sum is σ = 692248260240. Its totient is φ = 655443370080.

The previous prime is 673840665521. The next prime is 673840665527. The reversal of 673840665523 is 325566048376.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 673840665523 - 2¹ = 673840665521 is a prime.

It is a super-2 number, since 2×673840665523² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673840665521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2442088 + ... + 2703973.

It is an arithmetic number, because the mean of its divisors is an integer number (86531032530).

Almost surely, 2^673840665523 is an apocalyptic number.

673840665523 is a deficient number, since it is larger than the sum of its proper divisors (18407594717).

673840665523 is a wasteful number, since it uses less digits than its factorization.

673840665523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5149637.

The product of its (nonzero) digits is 21772800, while the sum is 55.

The spelling of 673840665523 in words is "six hundred seventy-three billion, eight hundred forty million, six hundred sixty-five thousand, five hundred twenty-three".