1720121953853 has 8 divisors (see below), whose sum is σ = 1780974149376. Its totient is φ = 1659605032800.

The previous prime is 1720121953819. The next prime is 1720121953859. The reversal of 1720121953853 is 3583591210271.

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 1720121953853 - 2⁶ = 1720121953789 is a prime.

It is a super-2 number, since 2×1720121953853² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720121953798 and 1720121953807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720121953859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83808176 + ... + 83828697.

It is an arithmetic number, because the mean of its divisors is an integer number (222621768672).

Almost surely, 2^{1720121953853} is an apocalyptic number.

It is an amenable number.

1720121953853 is a deficient number, since it is larger than the sum of its proper divisors (60852195523).

1720121953853 is a wasteful number, since it uses less digits than its factorization.

1720121953853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167637235.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 1720121953853 in words is "one trillion, seven hundred twenty billion, one hundred twenty-one million, nine hundred fifty-three thousand, eight hundred fifty-three".