1661733423 has 36 divisors (see below), whose sum is σ = 2795111280. Its totient is φ = 948560256.

The previous prime is 1661733419. The next prime is 1661733427. The reversal of 1661733423 is 3243371661.

1661733423 is a `hidden beast` number, since 1 + 6 + 617 + 3 + 34 + 2 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1661733419) and next prime (1661733427).

It is not a de Polignac number, because 1661733423 - 2² = 1661733419 is a prime.

It is a super-2 number, since 2×1661733423² = 5522715938230593858, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661733427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 686311 + ... + 688727.

It is an arithmetic number, because the mean of its divisors is an integer number (77641980).

Almost surely, 2^1661733423 is an apocalyptic number.

1661733423 is a deficient number, since it is larger than the sum of its proper divisors (1133377857).

1661733423 is a wasteful number, since it uses less digits than its factorization.

1661733423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996 (or 3986 counting only the distinct ones).

The product of its digits is 54432, while the sum is 36.

The square root of 1661733423 is about 40764.3646215662. The cubic root of 1661733423 is about 1184.4601439874.

The spelling of 1661733423 in words is "one billion, six hundred sixty-one million, seven hundred thirty-three thousand, four hundred twenty-three".