76639178828161 has 4 divisors (see below), whose sum is σ = 76642506793300. Its totient is φ = 76635850863024.

The previous prime is 76639178828101. The next prime is 76639178828167. The reversal of 76639178828161 is 16182887193667.

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 29439956739600 + 47199222088561 = 5425860^2 + 6870169^2 .

It is a cyclic number.

It is not a de Polignac number, because 76639178828161 - 2⁷ = 76639178828033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76639178828167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663948026 + ... + 1663994083.

It is an arithmetic number, because the mean of its divisors is an integer number (19160626698325).

Almost surely, 2^{76639178828161} is an apocalyptic number.

It is an amenable number.

76639178828161 is a deficient number, since it is larger than the sum of its proper divisors (3327965139).

76639178828161 is a wasteful number, since it uses less digits than its factorization.

76639178828161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327965138.

The product of its digits is 292626432, while the sum is 73.

The spelling of 76639178828161 in words is "seventy-six trillion, six hundred thirty-nine billion, one hundred seventy-eight million, eight hundred twenty-eight thousand, one hundred sixty-one".