1661372083 has 4 divisors (see below), whose sum is σ = 1898710960. Its totient is φ = 1424033208.

The previous prime is 1661372051. The next prime is 1661372101. The reversal of 1661372083 is 3802731661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1661372083 - 2⁵ = 1661372051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661370083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118669428 + ... + 118669441.

It is an arithmetic number, because the mean of its divisors is an integer number (474677740).

Almost surely, 2^1661372083 is an apocalyptic number.

1661372083 is a deficient number, since it is larger than the sum of its proper divisors (237338877).

1661372083 is an equidigital number, since it uses as much as digits as its factorization.

1661372083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237338876.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 1661372083 is about 40759.9323233000. The cubic root of 1661372083 is about 1184.3742850788.

The spelling of 1661372083 in words is "one billion, six hundred sixty-one million, three hundred seventy-two thousand, eighty-three".