673740688381 has 4 divisors (see below), whose sum is σ = 673826207200. Its totient is φ = 673655169564.

The previous prime is 673740688373. The next prime is 673740688391. The reversal of 673740688381 is 183886047376.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 673740688381 - 2³ = 673740688373 is a prime.

It is a super-2 number, since 2×673740688381² (a number of 24 digits) 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 (673740688331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42747591 + ... + 42763348.

It is an arithmetic number, because the mean of its divisors is an integer number (168456551800).

Almost surely, 2^673740688381 is an apocalyptic number.

It is an amenable number.

673740688381 is a deficient number, since it is larger than the sum of its proper divisors (85518819).

673740688381 is an equidigital number, since it uses as much as digits as its factorization.

673740688381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85518818.

The product of its (nonzero) digits is 32514048, while the sum is 61.

The spelling of 673740688381 in words is "six hundred seventy-three billion, seven hundred forty million, six hundred eighty-eight thousand, three hundred eighty-one".