61723173667 has 2 divisors, whose sum is σ = 61723173668. Its totient is φ = 61723173666.

The previous prime is 61723173647. The next prime is 61723173683. The reversal of 61723173667 is 76637132716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61723173667 - 2³⁵ = 27363435299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61723173667.

It is not a weakly prime, because it can be changed into another prime (61723173647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30861586833 + 30861586834.

It is an arithmetic number, because the mean of its divisors is an integer number (30861586834).

Almost surely, 2^61723173667 is an apocalyptic number.

61723173667 is a deficient number, since it is larger than the sum of its proper divisors (1).

61723173667 is an equidigital number, since it uses as much as digits as its factorization.

61723173667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 49.

The spelling of 61723173667 in words is "sixty-one billion, seven hundred twenty-three million, one hundred seventy-three thousand, six hundred sixty-seven".