16466561477 has 2 divisors, whose sum is σ = 16466561478. Its totient is φ = 16466561476.

The previous prime is 16466561459. The next prime is 16466561483. The reversal of 16466561477 is 77416566461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16355596321 + 110965156 = 127889^2 + 10534^2 .

It is a cyclic number.

It is not a de Polignac number, because 16466561477 - 2¹⁴ = 16466545093 is a prime.

It is a super-2 number, since 2×16466561477² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16466561417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8233280738 + 8233280739.

It is an arithmetic number, because the mean of its divisors is an integer number (8233280739).

Almost surely, 2^16466561477 is an apocalyptic number.

It is an amenable number.

16466561477 is a deficient number, since it is larger than the sum of its proper divisors (1).

16466561477 is an equidigital number, since it uses as much as digits as its factorization.

16466561477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 53.

The spelling of 16466561477 in words is "sixteen billion, four hundred sixty-six million, five hundred sixty-one thousand, four hundred seventy-seven".