67631780817 has 20 divisors (see below), whose sum is σ = 104513994420. Its totient is φ = 43533098784.

The previous prime is 67631780813. The next prime is 67631780831. The reversal of 67631780817 is 71808713676.

It can be written as a sum of positive squares in 2 ways, for example, as 22533312321 + 45098468496 = 150111^2 + 212364^2 .

It is not a de Polignac number, because 67631780817 - 2² = 67631780813 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (67631780813) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14393518 + ... + 14398215.

It is an arithmetic number, because the mean of its divisors is an integer number (5225699721).

Almost surely, 2^67631780817 is an apocalyptic number.

It is an amenable number.

67631780817 is a deficient number, since it is larger than the sum of its proper divisors (36882213603).

67631780817 is a wasteful number, since it uses less digits than its factorization.

67631780817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28791774 (or 28791765 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 67631780817 in words is "sixty-seven billion, six hundred thirty-one million, seven hundred eighty thousand, eight hundred seventeen".