145661377 has 2 divisors, whose sum is σ = 145661378. Its totient is φ = 145661376.

The previous prime is 145661371. The next prime is 145661381. The reversal of 145661377 is 773166541.

145661377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133263936 + 12397441 = 11544^2 + 3521^2 .

It is a cyclic number.

It is not a de Polignac number, because 145661377 - 2⁷ = 145661249 is a prime.

It is a super-2 number, since 2×145661377² = 42434473499072258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145661371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72830688 + 72830689.

It is an arithmetic number, because the mean of its divisors is an integer number (72830689).

Almost surely, 2^145661377 is an apocalyptic number.

It is an amenable number.

145661377 is a deficient number, since it is larger than the sum of its proper divisors (1).

145661377 is an equidigital number, since it uses as much as digits as its factorization.

145661377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 145661377 is about 12069.0255199001. The cubic root of 145661377 is about 526.1563350018.

The spelling of 145661377 in words is "one hundred forty-five million, six hundred sixty-one thousand, three hundred seventy-seven".