172066655477 has 2 divisors, whose sum is σ = 172066655478. Its totient is φ = 172066655476.

The previous prime is 172066655447. The next prime is 172066655483. The reversal of 172066655477 is 774556660271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172066506481 + 148996 = 414809^2 + 386^2 .

It is a cyclic number.

It is not a de Polignac number, because 172066655477 - 2¹⁶ = 172066589941 is a prime.

It is a super-2 number, since 2×172066655477² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172066655447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86033327738 + 86033327739.

It is an arithmetic number, because the mean of its divisors is an integer number (86033327739).

Almost surely, 2^172066655477 is an apocalyptic number.

It is an amenable number.

172066655477 is a deficient number, since it is larger than the sum of its proper divisors (1).

172066655477 is an equidigital number, since it uses as much as digits as its factorization.

172066655477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14817600, while the sum is 56.

The spelling of 172066655477 in words is "one hundred seventy-two billion, sixty-six million, six hundred fifty-five thousand, four hundred seventy-seven".