16661770331 has 8 divisors (see below), whose sum is σ = 17389526784. Its totient is φ = 15934291560.

The previous prime is 16661770327. The next prime is 16661770337. The reversal of 16661770331 is 13307716661.

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

It is a cyclic number.

It is not a de Polignac number, because 16661770331 - 2² = 16661770327 is a prime.

It is a super-2 number, since 2×16661770331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661770337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58220 + ... + 191606.

It is an arithmetic number, because the mean of its divisors is an integer number (2173690848).

Almost surely, 2^16661770331 is an apocalyptic number.

16661770331 is a deficient number, since it is larger than the sum of its proper divisors (727756453).

16661770331 is a wasteful number, since it uses less digits than its factorization.

16661770331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138841.

The product of its (nonzero) digits is 95256, while the sum is 41.

The spelling of 16661770331 in words is "sixteen billion, six hundred sixty-one million, seven hundred seventy thousand, three hundred thirty-one".