16621074277 has 12 divisors (see below), whose sum is σ = 17782237740. Its totient is φ = 15530553792.

The previous prime is 16621074229. The next prime is 16621074299. The reversal of 16621074277 is 77247012661.

It can be written as a sum of positive squares in 2 ways, for example, as 3038104161 + 13582970116 = 55119^2 + 116546^2 .

It is not a de Polignac number, because 16621074277 - 2⁷ = 16621074149 is a prime.

It is a super-2 number, since 2×16621074277² (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 (16621074677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289002 + ... + 341707.

It is an arithmetic number, because the mean of its divisors is an integer number (1481853145).

Almost surely, 2^16621074277 is an apocalyptic number.

It is an amenable number.

16621074277 is a deficient number, since it is larger than the sum of its proper divisors (1161163463).

16621074277 is an equidigital number, since it uses as much as digits as its factorization.

16621074277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630820 (or 630801 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 16621074277 in words is "sixteen billion, six hundred twenty-one million, seventy-four thousand, two hundred seventy-seven".