1661473023 has 8 divisors (see below), whose sum is σ = 2531768448. Its totient is φ = 949413144.

The previous prime is 1661473007. The next prime is 1661473061. The reversal of 1661473023 is 3203741661.

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

It is not a de Polignac number, because 1661473023 - 2⁴ = 1661473007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661473523) 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, 39558861 + ... + 39558902.

It is an arithmetic number, because the mean of its divisors is an integer number (316471056).

Almost surely, 2^1661473023 is an apocalyptic number.

1661473023 is a deficient number, since it is larger than the sum of its proper divisors (870295425).

1661473023 is an equidigital number, since it uses as much as digits as its factorization.

1661473023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79117773.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 1661473023 is about 40761.1705302976. The cubic root of 1661473023 is about 1184.3982709397.

The spelling of 1661473023 in words is "one billion, six hundred sixty-one million, four hundred seventy-three thousand, twenty-three".