1518362121509 has 2 divisors, whose sum is σ = 1518362121510. Its totient is φ = 1518362121508.

The previous prime is 1518362121421. The next prime is 1518362121547. The reversal of 1518362121509 is 9051212638151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1364107202500 + 154254919009 = 1167950^2 + 392753^2 .

It is an emirp because it is prime and its reverse (9051212638151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1518362121509 - 2⁸ = 1518362121253 is a prime.

It is a super-2 number, since 2×1518362121509² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1518362121509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1518362121599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 759181060754 + 759181060755.

It is an arithmetic number, because the mean of its divisors is an integer number (759181060755).

Almost surely, 2^{1518362121509} is an apocalyptic number.

It is an amenable number.

1518362121509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1518362121509 is an equidigital number, since it uses as much as digits as its factorization.

1518362121509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 1518362121509 in words is "one trillion, five hundred eighteen billion, three hundred sixty-two million, one hundred twenty-one thousand, five hundred nine".