1720661334 has 16 divisors (see below), whose sum is σ = 3932940288. Its totient is φ = 491617512.

The previous prime is 1720661311. The next prime is 1720661347. The reversal of 1720661334 is 4331660271.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1720661295 and 1720661304.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20484022 + ... + 20484105.

It is an arithmetic number, because the mean of its divisors is an integer number (245808768).

Almost surely, 2^1720661334 is an apocalyptic number.

1720661334 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1720661334 is an abundant number, since it is smaller than the sum of its proper divisors (2212278954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1720661334 is a wasteful number, since it uses less digits than its factorization.

1720661334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40968139.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 1720661334 is about 41480.8550297604. The cubic root of 1720661334 is about 1198.2988241959.

The spelling of 1720661334 in words is "one billion, seven hundred twenty million, six hundred sixty-one thousand, three hundred thirty-four".