67544994493 has 4 divisors (see below), whose sum is σ = 70481733408. Its totient is φ = 64608255580.

The previous prime is 67544994479. The next prime is 67544994511. The reversal of 67544994493 is 39449944576.

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 a de Polignac number, because none of the positive numbers 2^k-67544994493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67544994193) 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, 1468369423 + ... + 1468369468.

It is an arithmetic number, because the mean of its divisors is an integer number (17620433352).

Almost surely, 2^67544994493 is an apocalyptic number.

It is an amenable number.

67544994493 is a deficient number, since it is larger than the sum of its proper divisors (2936738915).

67544994493 is a wasteful number, since it uses less digits than its factorization.

67544994493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936738914.

The product of its digits is 117573120, while the sum is 64.

The spelling of 67544994493 in words is "sixty-seven billion, five hundred forty-four million, nine hundred ninety-four thousand, four hundred ninety-three".