1661101673 has 24 divisors (see below), whose sum is σ = 2126101824. Its totient is φ = 1269908640.

The previous prime is 1661101669. The next prime is 1661101681. The reversal of 1661101673 is 3761011661.

It is not a de Polignac number, because 1661101673 - 2² = 1661101669 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1661101973) 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 23 ways as a sum of consecutive naturals, for example, 26390 + ... + 63392.

It is an arithmetic number, because the mean of its divisors is an integer number (88587576).

Almost surely, 2^1661101673 is an apocalyptic number.

It is an amenable number.

1661101673 is a deficient number, since it is larger than the sum of its proper divisors (465000151).

1661101673 is a wasteful number, since it uses less digits than its factorization.

1661101673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37085 (or 37074 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1661101673 is about 40756.6150827077. The cubic root of 1661101673 is about 1184.3100241323.

The spelling of 1661101673 in words is "one billion, six hundred sixty-one million, one hundred one thousand, six hundred seventy-three".