1661693383267 has 16 divisors (see below), whose sum is σ = 1704375041248. Its totient is φ = 1619199590400.

The previous prime is 1661693383247. The next prime is 1661693383283. The reversal of 1661693383267 is 7623833961661.

It is a cyclic number.

It is not a de Polignac number, because 1661693383267 - 2¹⁹ = 1661692858979 is a prime.

It is a super-2 number, since 2×1661693383267² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661693383247) 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, 33341767 + ... + 33391567.

It is an arithmetic number, because the mean of its divisors is an integer number (106523440078).

Almost surely, 2^{1661693383267} is an apocalyptic number.

1661693383267 is a deficient number, since it is larger than the sum of its proper divisors (42681657981).

1661693383267 is a wasteful number, since it uses less digits than its factorization.

1661693383267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51670.

The product of its digits is 35271936, while the sum is 61.

The spelling of 1661693383267 in words is "one trillion, six hundred sixty-one billion, six hundred ninety-three million, three hundred eighty-three thousand, two hundred sixty-seven".