1661026226603 has 4 divisors (see below), whose sum is σ = 1705918827360. Its totient is φ = 1616133625848.

The previous prime is 1661026226597. The next prime is 1661026226609. The reversal of 1661026226603 is 3066226201661.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1661026226597) and next prime (1661026226609).

It is a cyclic number.

It is not a de Polignac number, because 1661026226603 - 2¹⁴ = 1661026210219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661026226609) 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, 22446300323 + ... + 22446300396.

It is an arithmetic number, because the mean of its divisors is an integer number (426479706840).

Almost surely, 2^{1661026226603} is an apocalyptic number.

1661026226603 is a deficient number, since it is larger than the sum of its proper divisors (44892600757).

1661026226603 is an equidigital number, since it uses as much as digits as its factorization.

1661026226603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44892600756.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 1661026226603 in words is "one trillion, six hundred sixty-one billion, twenty-six million, two hundred twenty-six thousand, six hundred three".