667156477 has 8 divisors (see below), whose sum is σ = 720054776. Its totient is φ = 614483712.

The previous prime is 667156471. The next prime is 667156489. The reversal of 667156477 is 774651766.

It can be written as a sum of positive squares in 4 ways, for example, as 82919236 + 584237241 = 9106^2 + 24171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667156477 - 2⁷ = 667156349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667156477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667156471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50208 + ... + 62089.

It is an arithmetic number, because the mean of its divisors is an integer number (90006847).

Almost surely, 2^667156477 is an apocalyptic number.

It is an amenable number.

667156477 is a deficient number, since it is larger than the sum of its proper divisors (52898299).

667156477 is a wasteful number, since it uses less digits than its factorization.

667156477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112767.

The product of its digits is 1481760, while the sum is 49.

The square root of 667156477 is about 25829.3723694557. The cubic root of 667156477 is about 873.7943567309.

The spelling of 667156477 in words is "six hundred sixty-seven million, one hundred fifty-six thousand, four hundred seventy-seven".