1445666513 has 2 divisors, whose sum is σ = 1445666514. Its totient is φ = 1445666512.

The previous prime is 1445666489. The next prime is 1445666543. The reversal of 1445666513 is 3156665441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1418501569 + 27164944 = 37663^2 + 5212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445666513 - 2¹⁸ = 1445404369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1445666543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722833256 + 722833257.

It is an arithmetic number, because the mean of its divisors is an integer number (722833257).

Almost surely, 2^1445666513 is an apocalyptic number.

It is an amenable number.

1445666513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445666513 is an equidigital number, since it uses as much as digits as its factorization.

1445666513 is an evil number, because the sum of its binary digits is even.

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

The square root of 1445666513 is about 38021.9214795886. The cubic root of 1445666513 is about 1130.7225162352.

The spelling of 1445666513 in words is "one billion, four hundred forty-five million, six hundred sixty-six thousand, five hundred thirteen".