16164878461 has 2 divisors, whose sum is σ = 16164878462. Its totient is φ = 16164878460.

The previous prime is 16164878399. The next prime is 16164878473. The reversal of 16164878461 is 16487846161.

It is a happy number.

16164878461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14998655961 + 1166222500 = 122469^2 + 34150^2 .

It is a cyclic number.

It is not a de Polignac number, because 16164878461 - 2²⁵ = 16131324029 is a prime.

It is a super-2 number, since 2×16164878461² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16164878399 and 16164878408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16164878761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8082439230 + 8082439231.

It is an arithmetic number, because the mean of its divisors is an integer number (8082439231).

Almost surely, 2^16164878461 is an apocalyptic number.

It is an amenable number.

16164878461 is a deficient number, since it is larger than the sum of its proper divisors (1).

16164878461 is an equidigital number, since it uses as much as digits as its factorization.

16164878461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 52.

The spelling of 16164878461 in words is "sixteen billion, one hundred sixty-four million, eight hundred seventy-eight thousand, four hundred sixty-one".