145320246509 has 2 divisors, whose sum is σ = 145320246510. Its totient is φ = 145320246508.

The previous prime is 145320246499. The next prime is 145320246541. The reversal of 145320246509 is 905642023541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128647755625 + 16672490884 = 358675^2 + 129122^2 .

It is a cyclic number.

It is not a de Polignac number, because 145320246509 - 2²⁸ = 145051811053 is a prime.

It is a super-2 number, since 2×145320246509² (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 (145320246569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72660123254 + 72660123255.

It is an arithmetic number, because the mean of its divisors is an integer number (72660123255).

Almost surely, 2^145320246509 is an apocalyptic number.

It is an amenable number.

145320246509 is a deficient number, since it is larger than the sum of its proper divisors (1).

145320246509 is an equidigital number, since it uses as much as digits as its factorization.

145320246509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 145320246509 in words is "one hundred forty-five billion, three hundred twenty million, two hundred forty-six thousand, five hundred nine".