66172755371 has 2 divisors, whose sum is σ = 66172755372. Its totient is φ = 66172755370.

The previous prime is 66172755269. The next prime is 66172755377. The reversal of 66172755371 is 17355727166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66172755371 - 2¹⁴ = 66172738987 is a prime.

It is not a weakly prime, because it can be changed into another prime (66172755377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33086377685 + 33086377686.

It is an arithmetic number, because the mean of its divisors is an integer number (33086377686).

Almost surely, 2^66172755371 is an apocalyptic number.

66172755371 is a deficient number, since it is larger than the sum of its proper divisors (1).

66172755371 is an equidigital number, since it uses as much as digits as its factorization.

66172755371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1852200, while the sum is 50.

The spelling of 66172755371 in words is "sixty-six billion, one hundred seventy-two million, seven hundred fifty-five thousand, three hundred seventy-one".