667156623 has 16 divisors (see below), whose sum is σ = 1017649920. Its totient is φ = 380846016.

The previous prime is 667156621. The next prime is 667156631. The reversal of 667156623 is 326651766.

It is not a de Polignac number, because 667156623 - 2¹ = 667156621 is a prime.

It is a super-2 number, since 2×667156623² = 890195919225528258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667156621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5811 + ... + 36987.

It is an arithmetic number, because the mean of its divisors is an integer number (63603120).

Almost surely, 2^667156623 is an apocalyptic number.

667156623 is a deficient number, since it is larger than the sum of its proper divisors (350493297).

667156623 is a wasteful number, since it uses less digits than its factorization.

667156623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32206.

The product of its digits is 272160, while the sum is 42.

The square root of 667156623 is about 25829.3751956953. The cubic root of 667156623 is about 873.7944204711.

The spelling of 667156623 in words is "six hundred sixty-seven million, one hundred fifty-six thousand, six hundred twenty-three".