16661171662 has 4 divisors (see below), whose sum is σ = 24991757496. Its totient is φ = 8330585830.

The previous prime is 16661171647. The next prime is 16661171663. The reversal of 16661171662 is 26617116661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26617116661 = 29 ⋅917831609.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661171663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165292914 + ... + 4165292917.

It is an arithmetic number, because the mean of its divisors is an integer number (6247939374).

Almost surely, 2^16661171662 is an apocalyptic number.

16661171662 is a deficient number, since it is larger than the sum of its proper divisors (8330585834).

16661171662 is an equidigital number, since it uses as much as digits as its factorization.

16661171662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330585833.

The product of its digits is 108864, while the sum is 43.

The spelling of 16661171662 in words is "sixteen billion, six hundred sixty-one million, one hundred seventy-one thousand, six hundred sixty-two".