1661356334 has 8 divisors (see below), whose sum is σ = 2718583128. Its totient is φ = 755161960.

The previous prime is 1661356327. The next prime is 1661356343. The reversal of 1661356334 is 4336531661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 in 3 ways as a sum of consecutive naturals, for example, 37758077 + ... + 37758120.

It is an arithmetic number, because the mean of its divisors is an integer number (339822891).

Almost surely, 2^1661356334 is an apocalyptic number.

1661356334 is a deficient number, since it is larger than the sum of its proper divisors (1057226794).

1661356334 is a wasteful number, since it uses less digits than its factorization.

1661356334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75516210.

The product of its digits is 116640, while the sum is 38.

The square root of 1661356334 is about 40759.7391306667. The cubic root of 1661356334 is about 1184.3705426361.

Adding to 1661356334 its reverse (4336531661), we get a palindrome (5997887995).

The spelling of 1661356334 in words is "one billion, six hundred sixty-one million, three hundred fifty-six thousand, three hundred thirty-four".