16672121077 has 4 divisors (see below), whose sum is σ = 16672381516. Its totient is φ = 16671860640.

The previous prime is 16672121033. The next prime is 16672121101. The reversal of 16672121077 is 77012127661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10601997156 + 6070123921 = 102966^2 + 77911^2 .

It is a cyclic number.

It is not a de Polignac number, because 16672121077 - 2¹¹ = 16672119029 is a prime.

It is a super-2 number, since 2×16672121077² (a number of 21 digits) contains 22 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 (16672151077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39793 + ... + 186889.

It is an arithmetic number, because the mean of its divisors is an integer number (4168095379).

Almost surely, 2^16672121077 is an apocalyptic number.

It is an amenable number.

16672121077 is a deficient number, since it is larger than the sum of its proper divisors (260439).

16672121077 is a wasteful number, since it uses less digits than its factorization.

16672121077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260438.

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 16672121077 in words is "sixteen billion, six hundred seventy-two million, one hundred twenty-one thousand, seventy-seven".