1661134784 has 14 divisors (see below), whose sum is σ = 3296314464. Its totient is φ = 830567360.

The previous prime is 1661134777. The next prime is 1661134801. The reversal of 1661134784 is 4874311661.

It is a super-2 number, since 2×1661134784² = 5518737541229453312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 12977552 + ... + 12977679.

Almost surely, 2^1661134784 is an apocalyptic number.

It is an amenable number.

1661134784 is a deficient number, since it is larger than the sum of its proper divisors (1635179680).

1661134784 is an equidigital number, since it uses as much as digits as its factorization.

1661134784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25955243 (or 25955233 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 1661134784 is about 40757.0212846817. The cubic root of 1661134784 is about 1184.3178930924.

The spelling of 1661134784 in words is "one billion, six hundred sixty-one million, one hundred thirty-four thousand, seven hundred eighty-four".