1720670455501 has 4 divisors (see below), whose sum is σ = 1720710707452. Its totient is φ = 1720630203552.

The previous prime is 1720670455451. The next prime is 1720670455657. The reversal of 1720670455501 is 1055540760271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 296669766276 + 1424000689225 = 544674^2 + 1193315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720670455501 - 2²⁷ = 1720536237773 is a prime.

It is a super-2 number, since 2×1720670455501² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720670456501) 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 in 3 ways as a sum of consecutive naturals, for example, 20061786 + ... + 20147371.

It is an arithmetic number, because the mean of its divisors is an integer number (430177676863).

Almost surely, 2^{1720670455501} is an apocalyptic number.

It is an amenable number.

1720670455501 is a deficient number, since it is larger than the sum of its proper divisors (40251951).

1720670455501 is an equidigital number, since it uses as much as digits as its factorization.

1720670455501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40251950.

The product of its (nonzero) digits is 294000, while the sum is 43.

The spelling of 1720670455501 in words is "one trillion, seven hundred twenty billion, six hundred seventy million, four hundred fifty-five thousand, five hundred one".