1556661226 has 8 divisors (see below), whose sum is σ = 2367879264. Its totient is φ = 767368140.

The previous prime is 1556661209. The next prime is 1556661263. The reversal of 1556661226 is 6221666551.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5481060 + ... + 5481343.

It is an arithmetic number, because the mean of its divisors is an integer number (295984908).

Almost surely, 2^1556661226 is an apocalyptic number.

1556661226 is a deficient number, since it is larger than the sum of its proper divisors (811218038).

1556661226 is a wasteful number, since it uses less digits than its factorization.

1556661226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962476.

The product of its digits is 129600, while the sum is 40.

The square root of 1556661226 is about 39454.5463286552. The cubic root of 1556661226 is about 1158.9500075587.

The spelling of 1556661226 in words is "one billion, five hundred fifty-six million, six hundred sixty-one thousand, two hundred twenty-six".