669991012101 has 12 divisors (see below), whose sum is σ = 968251869312. Its totient is φ = 446435871336.

The previous prime is 669991012081. The next prime is 669991012109. The reversal of 669991012101 is 101210199966.

It is not a de Polignac number, because 669991012101 - 2⁷ = 669991011973 is a prime.

It is a super-2 number, since 2×669991012101² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669991012109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18714741 + ... + 18750506.

It is an arithmetic number, because the mean of its divisors is an integer number (80687655776).

Almost surely, 2^669991012101 is an apocalyptic number.

It is an amenable number.

669991012101 is a deficient number, since it is larger than the sum of its proper divisors (298260857211).

669991012101 is a wasteful number, since it uses less digits than its factorization.

669991012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37467240 (or 37467237 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 669991012101 in words is "six hundred sixty-nine billion, nine hundred ninety-one million, twelve thousand, one hundred one".