16442217070661 has 4 divisors (see below), whose sum is σ = 16886601315852. Its totient is φ = 15997832825472.

The previous prime is 16442217070621. The next prime is 16442217070693. The reversal of 16442217070661 is 16607071224461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8717291680036 + 7724925390625 = 2952506^2 + 2779375^2 .

It is a cyclic number.

It is not a de Polignac number, because 16442217070661 - 2²² = 16442212876357 is a prime.

It is a super-3 number, since 3×16442217070661³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16442217070621) 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, 222192122540 + ... + 222192122613.

It is an arithmetic number, because the mean of its divisors is an integer number (4221650328963).

Almost surely, 2^{16442217070661} is an apocalyptic number.

It is an amenable number.

16442217070661 is a deficient number, since it is larger than the sum of its proper divisors (444384245191).

16442217070661 is an equidigital number, since it uses as much as digits as its factorization.

16442217070661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444384245190.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 16442217070661 in words is "sixteen trillion, four hundred forty-two billion, two hundred seventeen million, seventy thousand, six hundred sixty-one".