1720661045626 has 4 divisors (see below), whose sum is σ = 2580991568442. Its totient is φ = 860330522812.

The previous prime is 1720661045611. The next prime is 1720661045627. The reversal of 1720661045626 is 6265401660271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1535619118401 + 185041927225 = 1239201^2 + 430165^2 .

It is not an unprimeable number, because it can be changed into a prime (1720661045627) 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 as a sum of consecutive naturals, namely, 430165261405 + ... + 430165261408.

Almost surely, 2^{1720661045626} is an apocalyptic number.

1720661045626 is a deficient number, since it is larger than the sum of its proper divisors (860330522816).

1720661045626 is an equidigital number, since it uses as much as digits as its factorization.

1720661045626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860330522815.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 1720661045626 in words is "one trillion, seven hundred twenty billion, six hundred sixty-one million, forty-five thousand, six hundred twenty-six".