1720661260357 has 16 divisors (see below), whose sum is σ = 1937007278080. Its totient is φ = 1517610556800.

The previous prime is 1720661260309. The next prime is 1720661260379. The reversal of 1720661260357 is 7530621660271.

It is not a de Polignac number, because 1720661260357 - 2⁷ = 1720661260229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720661260057) 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, 26991144 + ... + 27054817.

It is an arithmetic number, because the mean of its divisors is an integer number (121062954880).

Almost surely, 2^{1720661260357} is an apocalyptic number.

It is an amenable number.

1720661260357 is a deficient number, since it is larger than the sum of its proper divisors (216346017723).

1720661260357 is a wasteful number, since it uses less digits than its factorization.

1720661260357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54046084.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 1720661260357 in words is "one trillion, seven hundred twenty billion, six hundred sixty-one million, two hundred sixty thousand, three hundred fifty-seven".