666101633421 has 16 divisors (see below), whose sum is σ = 1015026726528. Its totient is φ = 380623987200.

The previous prime is 666101633399. The next prime is 666101633429. The reversal of 666101633421 is 124336101666.

It is not a de Polignac number, because 666101633421 - 2⁹ = 666101632909 is a prime.

It is a super-2 number, since 2×666101633421² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666101633421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666101633429) 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, 1587301 + ... + 1962581.

It is an arithmetic number, because the mean of its divisors is an integer number (63439170408).

Almost surely, 2^666101633421 is an apocalyptic number.

It is an amenable number.

666101633421 is a deficient number, since it is larger than the sum of its proper divisors (348925093107).

666101633421 is a wasteful number, since it uses less digits than its factorization.

666101633421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459812.

The product of its (nonzero) digits is 93312, while the sum is 39.

The spelling of 666101633421 in words is "six hundred sixty-six billion, one hundred one million, six hundred thirty-three thousand, four hundred twenty-one".