145715521493 has 2 divisors, whose sum is σ = 145715521494. Its totient is φ = 145715521492.

The previous prime is 145715521489. The next prime is 145715521499. The reversal of 145715521493 is 394125517541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75986781649 + 69728739844 = 275657^2 + 264062^2 .

It is a cyclic number.

It is not a de Polignac number, because 145715521493 - 2² = 145715521489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145715521499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72857760746 + 72857760747.

It is an arithmetic number, because the mean of its divisors is an integer number (72857760747).

Almost surely, 2^145715521493 is an apocalyptic number.

It is an amenable number.

145715521493 is a deficient number, since it is larger than the sum of its proper divisors (1).

145715521493 is an equidigital number, since it uses as much as digits as its factorization.

145715521493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756000, while the sum is 47.

The spelling of 145715521493 in words is "one hundred forty-five billion, seven hundred fifteen million, five hundred twenty-one thousand, four hundred ninety-three".