1720231522697 has 4 divisors (see below), whose sum is σ = 1720931090640. Its totient is φ = 1719531954756.

The previous prime is 1720231522661. The next prime is 1720231522717. The reversal of 1720231522697 is 7962251320271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1720231522697 - 2³² = 1715936555401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720231522627) 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, 349780283 + ... + 349785200.

It is an arithmetic number, because the mean of its divisors is an integer number (430232772660).

Almost surely, 2^{1720231522697} is an apocalyptic number.

It is an amenable number.

1720231522697 is a deficient number, since it is larger than the sum of its proper divisors (699567943).

1720231522697 is an equidigital number, since it uses as much as digits as its factorization.

1720231522697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699567942.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 1720231522697 in words is "one trillion, seven hundred twenty billion, two hundred thirty-one million, five hundred twenty-two thousand, six hundred ninety-seven".