667729601 has 16 divisors (see below), whose sum is σ = 833059968. Its totient is φ = 519955200.

The previous prime is 667729591. The next prime is 667729603. The reversal of 667729601 is 106927766.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667729601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667729603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216611 + ... + 219671.

It is an arithmetic number, because the mean of its divisors is an integer number (52066248).

Almost surely, 2^667729601 is an apocalyptic number.

It is an amenable number.

667729601 is a deficient number, since it is larger than the sum of its proper divisors (165330367).

667729601 is a wasteful number, since it uses less digits than its factorization.

667729601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5912.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 667729601 is about 25840.4644114613. The cubic root of 667729601 is about 874.0444975399.

The spelling of 667729601 in words is "six hundred sixty-seven million, seven hundred twenty-nine thousand, six hundred one".