1669432491 has 16 divisors (see below), whose sum is σ = 2553016320. Its totient is φ = 1077052680.

The previous prime is 1669432481. The next prime is 1669432517. The reversal of 1669432491 is 1942349661.

It is a de Polignac number, because none of the positive numbers 2^k-1669432491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1669432411) 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 15 ways as a sum of consecutive naturals, for example, 996435 + ... + 998108.

It is an arithmetic number, because the mean of its divisors is an integer number (159563520).

Almost surely, 2^1669432491 is an apocalyptic number.

1669432491 is a deficient number, since it is larger than the sum of its proper divisors (883583829).

1669432491 is a wasteful number, since it uses less digits than its factorization.

1669432491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994583 (or 1994577 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 1669432491 is about 40858.6892961583. The cubic root of 1669432491 is about 1186.2865885081.

The spelling of 1669432491 in words is "one billion, six hundred sixty-nine million, four hundred thirty-two thousand, four hundred ninety-one".