66150178447 has 2 divisors, whose sum is σ = 66150178448. Its totient is φ = 66150178446.

The previous prime is 66150178429. The next prime is 66150178463. The reversal of 66150178447 is 74487105166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66150178447 - 2⁷ = 66150178319 is a prime.

It is a super-2 number, since 2×66150178447² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66150178447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66150170447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33075089223 + 33075089224.

It is an arithmetic number, because the mean of its divisors is an integer number (33075089224).

Almost surely, 2^66150178447 is an apocalyptic number.

66150178447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66150178447 is an equidigital number, since it uses as much as digits as its factorization.

66150178447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 66150178447 in words is "sixty-six billion, one hundred fifty million, one hundred seventy-eight thousand, four hundred forty-seven".