1720622371451 has 4 divisors (see below), whose sum is σ = 1720625030400. Its totient is φ = 1720619712504.

The previous prime is 1720622371421. The next prime is 1720622371483. The reversal of 1720622371451 is 1541732260271.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1720622371451 - 2¹⁰ = 1720622370427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720622371399 and 1720622371408.

It is not an unprimeable number, because it can be changed into a prime (1720622371421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339965 + ... + 1885953.

It is an arithmetic number, because the mean of its divisors is an integer number (430156257600).

Almost surely, 2^{1720622371451} is an apocalyptic number.

1720622371451 is a deficient number, since it is larger than the sum of its proper divisors (2658949).

1720622371451 is a wasteful number, since it uses less digits than its factorization.

1720622371451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658948.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 1720622371451 in words is "one trillion, seven hundred twenty billion, six hundred twenty-two million, three hundred seventy-one thousand, four hundred fifty-one".