667554696 has 80 divisors (see below), whose sum is σ = 1873697100. Its totient is φ = 222051456.

The previous prime is 667554689. The next prime is 667554697. The reversal of 667554696 is 696455766.

667554696 is a `hidden beast` number, since 6 + 6 + 7 + 5 + 546 + 96 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 659770596 + 7784100 = 25686^2 + 2790^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (667554697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 458706 + ... + 460158.

Almost surely, 2^667554696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667554696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936848550).

667554696 is an abundant number, since it is smaller than the sum of its proper divisors (1206142404).

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

667554696 is a wasteful number, since it uses less digits than its factorization.

667554696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180 (or 2167 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The square root of 667554696 is about 25837.0798659601. The cubic root of 667554696 is about 873.9681751770.

The spelling of 667554696 in words is "six hundred sixty-seven million, five hundred fifty-four thousand, six hundred ninety-six".