667481184637 has 4 divisors (see below), whose sum is σ = 673604865340. Its totient is φ = 661357503936.

The previous prime is 667481184631. The next prime is 667481184661. The reversal of 667481184637 is 736481184766.

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 325851455556 + 341629729081 = 570834^2 + 584491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667481184637 is a prime.

It is a super-2 number, since 2×667481184637² (a number of 24 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 (667481184631) 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, 3061840188 + ... + 3061840405.

It is an arithmetic number, because the mean of its divisors is an integer number (168401216335).

Almost surely, 2^667481184637 is an apocalyptic number.

It is an amenable number.

667481184637 is a deficient number, since it is larger than the sum of its proper divisors (6123680703).

667481184637 is a wasteful number, since it uses less digits than its factorization.

667481184637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6123680702.

The product of its digits is 32514048, while the sum is 61.

The spelling of 667481184637 in words is "six hundred sixty-seven billion, four hundred eighty-one million, one hundred eighty-four thousand, six hundred thirty-seven".