618860266381655 has 4 divisors (see below), whose sum is σ = 742632319657992. Its totient is φ = 495088213105320.

The previous prime is 618860266381589. The next prime is 618860266381711. The reversal of 618860266381655 is 556183662068816.

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

It is not a de Polignac number, because 618860266381655 - 2³⁴ = 618843086512471 is a prime.

It is a super-2 number, since 2×618860266381655² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61886026638161 + ... + 61886026638170.

It is an arithmetic number, because the mean of its divisors is an integer number (185658079914498).

Almost surely, 2^{618860266381655} is an apocalyptic number.

618860266381655 is a deficient number, since it is larger than the sum of its proper divisors (123772053276337).

618860266381655 is a wasteful number, since it uses less digits than its factorization.

618860266381655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123772053276336.

The product of its (nonzero) digits is 597196800, while the sum is 71.

The spelling of 618860266381655 in words is "six hundred eighteen trillion, eight hundred sixty billion, two hundred sixty-six million, three hundred eighty-one thousand, six hundred fifty-five".