1720623225257 has 4 divisors (see below), whose sum is σ = 1723679394960. Its totient is φ = 1717567055556.

The previous prime is 1720623225193. The next prime is 1720623225329. The reversal of 1720623225257 is 7525223260271.

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 1720623225257 - 2⁶ = 1720623225193 is a prime.

It is a super-4 number, since 4×1720623225257⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720623225757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528084007 + ... + 1528085132.

It is an arithmetic number, because the mean of its divisors is an integer number (430919848740).

Almost surely, 2^{1720623225257} is an apocalyptic number.

It is an amenable number.

1720623225257 is a deficient number, since it is larger than the sum of its proper divisors (3056169703).

1720623225257 is an equidigital number, since it uses as much as digits as its factorization.

1720623225257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056169702.

The product of its (nonzero) digits is 705600, while the sum is 44.

The spelling of 1720623225257 in words is "one trillion, seven hundred twenty billion, six hundred twenty-three million, two hundred twenty-five thousand, two hundred fifty-seven".