16661732036251 has 4 divisors (see below), whose sum is σ = 16666448069232. Its totient is φ = 16657016003272.

The previous prime is 16661732036239. The next prime is 16661732036267. The reversal of 16661732036251 is 15263023716661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16661732036251 - 2⁷ = 16661732036123 is a prime.

It is a super-2 number, since 2×16661732036251² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16661732036195 and 16661732036204.

It is not an unprimeable number, because it can be changed into a prime (16661732036281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2358011191 + ... + 2358018256.

It is an arithmetic number, because the mean of its divisors is an integer number (4166612017308).

Almost surely, 2^{16661732036251} is an apocalyptic number.

16661732036251 is a deficient number, since it is larger than the sum of its proper divisors (4716032981).

16661732036251 is an equidigital number, since it uses as much as digits as its factorization.

16661732036251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4716032980.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 16661732036251 in words is "sixteen trillion, six hundred sixty-one billion, seven hundred thirty-two million, thirty-six thousand, two hundred fifty-one".