1616081866 has 16 divisors (see below), whose sum is σ = 2790651456. Its totient is φ = 687550176.

The previous prime is 1616081837. The next prime is 1616081881. The reversal of 1616081866 is 6681806161.

It is a super-2 number, since 2×1616081866² = 5223441195228083912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419376 + ... + 423211.

It is an arithmetic number, because the mean of its divisors is an integer number (174415716).

Almost surely, 2^1616081866 is an apocalyptic number.

1616081866 is a deficient number, since it is larger than the sum of its proper divisors (1174569590).

1616081866 is a wasteful number, since it uses less digits than its factorization.

1616081866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842733.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 1616081866 is about 40200.5207180206. The cubic root of 1616081866 is about 1173.5126776011.

The spelling of 1616081866 in words is "one billion, six hundred sixteen million, eighty-one thousand, eight hundred sixty-six".