1720652016621 has 8 divisors (see below), whose sum is σ = 2295830943360. Its totient is φ = 1146287217152.

The previous prime is 1720652016563. The next prime is 1720652016641. The reversal of 1720652016621 is 1266102560271.

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

It is a cyclic number.

It is not a de Polignac number, because 1720652016621 - 2¹³ = 1720652008429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720652016621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720652016641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203526885 + ... + 203535338.

It is an arithmetic number, because the mean of its divisors is an integer number (286978867920).

Almost surely, 2^{1720652016621} is an apocalyptic number.

It is an amenable number.

1720652016621 is a deficient number, since it is larger than the sum of its proper divisors (575178926739).

1720652016621 is a wasteful number, since it uses less digits than its factorization.

1720652016621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407063635.

The product of its (nonzero) digits is 60480, while the sum is 39.

Adding to 1720652016621 its reverse (1266102560271), we get a palindrome (2986754576892).

The spelling of 1720652016621 in words is "one trillion, seven hundred twenty billion, six hundred fifty-two million, sixteen thousand, six hundred twenty-one".