667773672381 has 24 divisors (see below), whose sum is σ = 993103655544. Its totient is φ = 432119600640.

The previous prime is 667773672337. The next prime is 667773672443. The reversal of 667773672381 is 183276377766.

It is a happy number.

667773672381 is a `hidden beast` number, since 66 + 77 + 73 + 67 + 2 + 381 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 243699208281 + 424074464100 = 493659^2 + 651210^2 .

It is not a de Polignac number, because 667773672381 - 2⁶ = 667773672317 is a prime.

It is a super-2 number, since 2×667773672381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667773672281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4520416 + ... + 4665801.

It is an arithmetic number, because the mean of its divisors is an integer number (41379318981).

Almost surely, 2^667773672381 is an apocalyptic number.

It is an amenable number.

667773672381 is a deficient number, since it is larger than the sum of its proper divisors (325329983163).

667773672381 is a wasteful number, since it uses less digits than its factorization.

667773672381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186461 (or 9186458 counting only the distinct ones).

The product of its digits is 74680704, while the sum is 63.

The spelling of 667773672381 in words is "six hundred sixty-seven billion, seven hundred seventy-three million, six hundred seventy-two thousand, three hundred eighty-one".