145667693 has 2 divisors, whose sum is σ = 145667694. Its totient is φ = 145667692.

The previous prime is 145667681. The next prime is 145667707. The reversal of 145667693 is 396766541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90878089 + 54789604 = 9533^2 + 7402^2 .

It is an emirp because it is prime and its reverse (396766541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145667693 - 2²⁴ = 128890477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145667293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72833846 + 72833847.

It is an arithmetic number, because the mean of its divisors is an integer number (72833847).

Almost surely, 2^145667693 is an apocalyptic number.

It is an amenable number.

145667693 is a deficient number, since it is larger than the sum of its proper divisors (1).

145667693 is an equidigital number, since it uses as much as digits as its factorization.

145667693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 145667693 is about 12069.2871786200. The cubic root of 145667693 is about 526.1639397525.

The spelling of 145667693 in words is "one hundred forty-five million, six hundred sixty-seven thousand, six hundred ninety-three".