667538190321 has 16 divisors (see below), whose sum is σ = 897102839808. Its totient is φ = 441499842000.

The previous prime is 667538190301. The next prime is 667538190349. The reversal of 667538190321 is 123091835766.

It is not a de Polignac number, because 667538190321 - 2⁵ = 667538190289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667538190301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13153846 + ... + 13204496.

It is an arithmetic number, because the mean of its divisors is an integer number (56068927488).

Almost surely, 2^667538190321 is an apocalyptic number.

It is an amenable number.

667538190321 is a deficient number, since it is larger than the sum of its proper divisors (229564649487).

667538190321 is a wasteful number, since it uses less digits than its factorization.

667538190321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85372.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 667538190321 in words is "six hundred sixty-seven billion, five hundred thirty-eight million, one hundred ninety thousand, three hundred twenty-one".