16165011001661 has 32 divisors (see below), whose sum is σ = 17349794611200. Its totient is φ = 15016183056000.

The previous prime is 16165011001651. The next prime is 16165011001679. The reversal of 16165011001661 is 16610011056161.

It is not a de Polignac number, because 16165011001661 - 2¹⁸ = 16165010739517 is a prime.

It is a super-2 number, since 2×16165011001661² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16165011001651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207975596 + ... + 208053306.

It is an arithmetic number, because the mean of its divisors is an integer number (542181081600).

Almost surely, 2^{16165011001661} is an apocalyptic number.

It is an amenable number.

16165011001661 is a deficient number, since it is larger than the sum of its proper divisors (1184783609539).

16165011001661 is a wasteful number, since it uses less digits than its factorization.

16165011001661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78641.

The product of its (nonzero) digits is 6480, while the sum is 35.

It can be divided in two parts, 1616501 and 1001661, that added together give a palindrome (2618162).

The spelling of 16165011001661 in words is "sixteen trillion, one hundred sixty-five billion, eleven million, one thousand, six hundred sixty-one".