1720661151 has 16 divisors (see below), whose sum is σ = 2522492928. Its totient is φ = 1034611200.

The previous prime is 1720661143. The next prime is 1720661153. The reversal of 1720661151 is 1511660271.

It is not a de Polignac number, because 1720661151 - 2³ = 1720661143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720661153) 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, 201090 + ... + 209471.

It is an arithmetic number, because the mean of its divisors is an integer number (157655808).

Almost surely, 2^1720661151 is an apocalyptic number.

1720661151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1720661151 is a deficient number, since it is larger than the sum of its proper divisors (801831777).

1720661151 is a wasteful number, since it uses less digits than its factorization.

1720661151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410702.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1720661151 is about 41480.8528239235. The cubic root of 1720661151 is about 1198.2987817144.

The spelling of 1720661151 in words is "one billion, seven hundred twenty million, six hundred sixty-one thousand, one hundred fifty-one".