16661061631156 has 12 divisors (see below), whose sum is σ = 29156912061760. Its totient is φ = 8330515327800.

The previous prime is 16661061631121. The next prime is 16661061631169. The reversal of 16661061631156 is 65113616016661.

It is a congruent number.

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, 1254966 + ... + 5907373.

Almost surely, 2^{16661061631156} is an apocalyptic number.

It is an amenable number.

16661061631156 is a deficient number, since it is larger than the sum of its proper divisors (12495850430604).

16661061631156 is a wasteful number, since it uses less digits than its factorization.

16661061631156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743894 (or 7743892 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 16661061631156 in words is "sixteen trillion, six hundred sixty-one billion, sixty-one million, six hundred thirty-one thousand, one hundred fifty-six".