667661403 has 8 divisors (see below), whose sum is σ = 920912400. Its totient is φ = 429759008.

The previous prime is 667661399. The next prime is 667661419. The reversal of 667661403 is 304166766.

It is a happy number.

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 667661403 - 2² = 667661399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667661443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3837048 + ... + 3837221.

It is an arithmetic number, because the mean of its divisors is an integer number (115114050).

Almost surely, 2^667661403 is an apocalyptic number.

667661403 is a deficient number, since it is larger than the sum of its proper divisors (253250997).

667661403 is a wasteful number, since it uses less digits than its factorization.

667661403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7674301.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 667661403 is about 25839.1447807392. The cubic root of 667661403 is about 874.0147399274.

The spelling of 667661403 in words is "six hundred sixty-seven million, six hundred sixty-one thousand, four hundred three".