1555656105506 has 4 divisors (see below), whose sum is σ = 2333484158262. Its totient is φ = 777828052752.

The previous prime is 1555656105503. The next prime is 1555656105511. The reversal of 1555656105506 is 6055016565551.

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

It can be written as a sum of positive squares in only one way, i.e., 1525706688025 + 29949417481 = 1235195^2 + 173059^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1555656105503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388914026375 + ... + 388914026378.

Almost surely, 2^{1555656105506} is an apocalyptic number.

1555656105506 is a deficient number, since it is larger than the sum of its proper divisors (777828052756).

1555656105506 is an equidigital number, since it uses as much as digits as its factorization.

1555656105506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777828052755.

The product of its (nonzero) digits is 3375000, while the sum is 50.

The spelling of 1555656105506 in words is "one trillion, five hundred fifty-five billion, six hundred fifty-six million, one hundred five thousand, five hundred six".