1555332420666 has 8 divisors (see below), whose sum is σ = 3110664841344. Its totient is φ = 518444140220.

The previous prime is 1555332420643. The next prime is 1555332420667. The reversal of 1555332420666 is 6660242335551.

It is a happy number.

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

1555332420666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1555332420667) 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, 129611035050 + ... + 129611035061.

It is an arithmetic number, because the mean of its divisors is an integer number (388833105168).

Almost surely, 2^{1555332420666} is an apocalyptic number.

1555332420666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555332420666 is a wasteful number, since it uses less digits than its factorization.

1555332420666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259222070116.

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 1555332420666 in words is "one trillion, five hundred fifty-five billion, three hundred thirty-two million, four hundred twenty thousand, six hundred sixty-six".