618200643491 has 2 divisors, whose sum is σ = 618200643492. Its totient is φ = 618200643490.

The previous prime is 618200643433. The next prime is 618200643509. The reversal of 618200643491 is 194346002816.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618200643491 is a prime.

It is a super-2 number, since 2×618200643491² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (618200643191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309100321745 + 309100321746.

It is an arithmetic number, because the mean of its divisors is an integer number (309100321746).

Almost surely, 2^618200643491 is an apocalyptic number.

618200643491 is a deficient number, since it is larger than the sum of its proper divisors (1).

618200643491 is an equidigital number, since it uses as much as digits as its factorization.

618200643491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 618200643491 in words is "six hundred eighteen billion, two hundred million, six hundred forty-three thousand, four hundred ninety-one".