16661155755 has 16 divisors (see below), whose sum is σ = 26665696800. Its totient is φ = 8883333888.

The previous prime is 16661155741. The next prime is 16661155793. The reversal of 16661155755 is 55755116661.

It is not a de Polignac number, because 16661155755 - 2⁹ = 16661155243 is a prime.

It is a super-2 number, since 2×16661155755² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110280 + ... + 213269.

It is an arithmetic number, because the mean of its divisors is an integer number (1666606050).

Almost surely, 2^16661155755 is an apocalyptic number.

16661155755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16661155755 is a deficient number, since it is larger than the sum of its proper divisors (10004541045).

16661155755 is a wasteful number, since it uses less digits than its factorization.

16661155755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326990.

The product of its digits is 945000, while the sum is 48.

The spelling of 16661155755 in words is "sixteen billion, six hundred sixty-one million, one hundred fifty-five thousand, seven hundred fifty-five".