145717777 has 2 divisors, whose sum is σ = 145717778. Its totient is φ = 145717776.

The previous prime is 145717771. The next prime is 145717807. The reversal of 145717777 is 777717541.

145717777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133263936 + 12453841 = 11544^2 + 3529^2 .

It is a cyclic number.

It is not a de Polignac number, because 145717777 - 2³ = 145717769 is a prime.

It is not a weakly prime, because it can be changed into another prime (145717771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72858888 + 72858889.

It is an arithmetic number, because the mean of its divisors is an integer number (72858889).

Almost surely, 2^145717777 is an apocalyptic number.

It is an amenable number.

145717777 is a deficient number, since it is larger than the sum of its proper divisors (1).

145717777 is an equidigital number, since it uses as much as digits as its factorization.

145717777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336140, while the sum is 46.

The square root of 145717777 is about 12071.3618535773. The cubic root of 145717777 is about 526.2242353806.

The spelling of 145717777 in words is "one hundred forty-five million, seven hundred seventeen thousand, seven hundred seventy-seven".