618218266513 has 4 divisors (see below), whose sum is σ = 618220216548. Its totient is φ = 618216316480.

The previous prime is 618218266507. The next prime is 618218266553. The reversal of 618218266513 is 315662812816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57961525504 + 560256741009 = 240752^2 + 748503^2 .

It is a cyclic number.

It is not a de Polignac number, because 618218266513 - 2³⁷ = 480779313041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618218266553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377356 + ... + 1174237.

It is an arithmetic number, because the mean of its divisors is an integer number (154555054137).

Almost surely, 2^618218266513 is an apocalyptic number.

It is an amenable number.

618218266513 is a deficient number, since it is larger than the sum of its proper divisors (1950035).

618218266513 is a wasteful number, since it uses less digits than its factorization.

618218266513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950034.

The product of its digits is 829440, while the sum is 49.

The spelling of 618218266513 in words is "six hundred eighteen billion, two hundred eighteen million, two hundred sixty-six thousand, five hundred thirteen".