1616000666556 has 12 divisors (see below), whose sum is σ = 3770668221992. Its totient is φ = 538666888848.

The previous prime is 1616000666551. The next prime is 1616000666587. The reversal of 1616000666556 is 6556660006161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1616000666556² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616000666551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67333361095 + ... + 67333361118.

Almost surely, 2^{1616000666556} is an apocalyptic number.

It is an amenable number.

1616000666556 is an abundant number, since it is smaller than the sum of its proper divisors (2154667555436).

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

1616000666556 is a wasteful number, since it uses less digits than its factorization.

1616000666556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134666722220 (or 134666722218 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 1616000666556 in words is "one trillion, six hundred sixteen billion, six hundred sixty-six thousand, five hundred fifty-six".