667656550 has 24 divisors (see below), whose sum is σ = 1354736952. Its totient is φ = 242784000.

The previous prime is 667656533. The next prime is 667656553. The reversal of 667656550 is 55656766.

It is a self number, because there is not a number n which added to its sum of digits gives 667656550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667656553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 606411 + ... + 607510.

It is an arithmetic number, because the mean of its divisors is an integer number (56447373).

Almost surely, 2^667656550 is an apocalyptic number.

667656550 is an abundant number, since it is smaller than the sum of its proper divisors (687080402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667656550 is a wasteful number, since it uses less digits than its factorization.

667656550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213944 (or 1213939 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 46.

The square root of 667656550 is about 25839.0508726617. The cubic root of 667656550 is about 874.0126222852.

The spelling of 667656550 in words is "six hundred sixty-seven million, six hundred fifty-six thousand, five hundred fifty".