145218856493 has 2 divisors, whose sum is σ = 145218856494. Its totient is φ = 145218856492.

The previous prime is 145218856457. The next prime is 145218856579. The reversal of 145218856493 is 394658812541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91163536489 + 54055320004 = 301933^2 + 232498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145218856493 is a prime.

It is a super-2 number, since 2×145218856493² (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 (145218856423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72609428246 + 72609428247.

It is an arithmetic number, because the mean of its divisors is an integer number (72609428247).

Almost surely, 2^145218856493 is an apocalyptic number.

It is an amenable number.

145218856493 is a deficient number, since it is larger than the sum of its proper divisors (1).

145218856493 is an equidigital number, since it uses as much as digits as its factorization.

145218856493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8294400, while the sum is 56.

The spelling of 145218856493 in words is "one hundred forty-five billion, two hundred eighteen million, eight hundred fifty-six thousand, four hundred ninety-three".