1661385226 has 8 divisors (see below), whose sum is σ = 2499020640. Its totient is φ = 828378348.

The previous prime is 1661385221. The next prime is 1661385233. The reversal of 1661385226 is 6225831661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1661385221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1156236 + ... + 1157671.

It is an arithmetic number, because the mean of its divisors is an integer number (312377580).

Almost surely, 2^1661385226 is an apocalyptic number.

1661385226 is a deficient number, since it is larger than the sum of its proper divisors (837635414).

1661385226 is a wasteful number, since it uses less digits than its factorization.

1661385226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2314268.

The product of its digits is 103680, while the sum is 40.

The square root of 1661385226 is about 40760.0935474883. The cubic root of 1661385226 is about 1184.3774082383.

The spelling of 1661385226 in words is "one billion, six hundred sixty-one million, three hundred eighty-five thousand, two hundred twenty-six".