618860266381631 has 4 divisors (see below), whose sum is σ = 618864267417264. Its totient is φ = 618856265346000.

The previous prime is 618860266381589. The next prime is 618860266381711. The reversal of 618860266381631 is 136183662068816.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 618860266381631 - 2¹⁰ = 618860266380607 is a prime.

It is a super-2 number, since 2×618860266381631² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618860266311631) 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, 2000285795 + ... + 2000595156.

It is an arithmetic number, because the mean of its divisors is an integer number (154716066854316).

Almost surely, 2^{618860266381631} is an apocalyptic number.

618860266381631 is a deficient number, since it is larger than the sum of its proper divisors (4001035633).

618860266381631 is a wasteful number, since it uses less digits than its factorization.

618860266381631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001035632.

The product of its (nonzero) digits is 71663616, while the sum is 65.

The spelling of 618860266381631 in words is "six hundred eighteen trillion, eight hundred sixty billion, two hundred sixty-six million, three hundred eighty-one thousand, six hundred thirty-one".