1661194479 has 16 divisors (see below), whose sum is σ = 2531916800. Its totient is φ = 949039200.

The previous prime is 1661194477. The next prime is 1661194487. The reversal of 1661194479 is 9744911661.

It is not a de Polignac number, because 1661194479 - 2¹ = 1661194477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661194477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161997 + ... + 171945.

It is an arithmetic number, because the mean of its divisors is an integer number (158244800).

Almost surely, 2^1661194479 is an apocalyptic number.

1661194479 is a deficient number, since it is larger than the sum of its proper divisors (870722321).

1661194479 is an equidigital number, since it uses as much as digits as its factorization.

1661194479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17910.

The product of its digits is 326592, while the sum is 48.

The square root of 1661194479 is about 40757.7536059091. The cubic root of 1661194479 is about 1184.3320795812.

The spelling of 1661194479 in words is "one billion, six hundred sixty-one million, one hundred ninety-four thousand, four hundred seventy-nine".