145697644769 has 2 divisors, whose sum is σ = 145697644770. Its totient is φ = 145697644768.

The previous prime is 145697644711. The next prime is 145697644777. The reversal of 145697644769 is 967446796541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108710662369 + 36986982400 = 329713^2 + 192320^2 .

It is an emirp because it is prime and its reverse (967446796541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145697644769 is a prime.

It is a super-2 number, since 2×145697644769² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 145697644699 and 145697644708.

It is not a weakly prime, because it can be changed into another prime (145697644069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72848822384 + 72848822385.

It is an arithmetic number, because the mean of its divisors is an integer number (72848822385).

Almost surely, 2^145697644769 is an apocalyptic number.

It is an amenable number.

145697644769 is a deficient number, since it is larger than the sum of its proper divisors (1).

145697644769 is an equidigital number, since it uses as much as digits as its factorization.

145697644769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 274337280, while the sum is 68.

The spelling of 145697644769 in words is "one hundred forty-five billion, six hundred ninety-seven million, six hundred forty-four thousand, seven hundred sixty-nine".