1661354423 has 8 divisors (see below), whose sum is σ = 1734242400. Its totient is φ = 1588521088.

The previous prime is 1661354413. The next prime is 1661354441. The reversal of 1661354423 is 3244531661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661354423 - 2¹⁰ = 1661353399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661354413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56123 + ... + 80451.

It is an arithmetic number, because the mean of its divisors is an integer number (216780300).

Almost surely, 2^1661354423 is an apocalyptic number.

1661354423 is a deficient number, since it is larger than the sum of its proper divisors (72887977).

1661354423 is a wasteful number, since it uses less digits than its factorization.

1661354423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27321.

The product of its digits is 51840, while the sum is 35.

The square root of 1661354423 is about 40759.7156884098. The cubic root of 1661354423 is about 1184.3700885226.

The spelling of 1661354423 in words is "one billion, six hundred sixty-one million, three hundred fifty-four thousand, four hundred twenty-three".