1661575123 has 8 divisors (see below), whose sum is σ = 1790334000. Its totient is φ = 1532951328.

The previous prime is 1661575109. The next prime is 1661575127. The reversal of 1661575123 is 3215751661.

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 1661575123 - 2¹³ = 1661566931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661575127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7453 + ... + 58126.

It is an arithmetic number, because the mean of its divisors is an integer number (223791750).

Almost surely, 2^1661575123 is an apocalyptic number.

1661575123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1661575123 is a deficient number, since it is larger than the sum of its proper divisors (128758877).

1661575123 is a wasteful number, since it uses less digits than its factorization.

1661575123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67541.

The product of its digits is 37800, while the sum is 37.

The square root of 1661575123 is about 40762.4229284767. The cubic root of 1661575123 is about 1184.4225314573.

The spelling of 1661575123 in words is "one billion, six hundred sixty-one million, five hundred seventy-five thousand, one hundred twenty-three".