16662372801 has 4 divisors (see below), whose sum is σ = 22216497072. Its totient is φ = 11108248532.

The previous prime is 16662372787. The next prime is 16662372803. The reversal of 16662372801 is 10827326661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10827326661 = 3 ⋅3609108887.

It is a cyclic number.

It is not a de Polignac number, because 16662372801 - 2⁹ = 16662372289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16662372803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777062131 + ... + 2777062136.

It is an arithmetic number, because the mean of its divisors is an integer number (5554124268).

Almost surely, 2^16662372801 is an apocalyptic number.

It is an amenable number.

16662372801 is a deficient number, since it is larger than the sum of its proper divisors (5554124271).

16662372801 is an equidigital number, since it uses as much as digits as its factorization.

16662372801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5554124270.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 16662372801 in words is "sixteen billion, six hundred sixty-two million, three hundred seventy-two thousand, eight hundred one".