76072172821 has 2 divisors, whose sum is σ = 76072172822. Its totient is φ = 76072172820.

The previous prime is 76072172801. The next prime is 76072172833. The reversal of 76072172821 is 12827127067.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73068036721 + 3004136100 = 270311^2 + 54810^2 .

It is a cyclic number.

It is not a de Polignac number, because 76072172821 - 2¹³ = 76072164629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76072172801) 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, 38036086410 + 38036086411.

It is an arithmetic number, because the mean of its divisors is an integer number (38036086411).

Almost surely, 2^76072172821 is an apocalyptic number.

It is an amenable number.

76072172821 is a deficient number, since it is larger than the sum of its proper divisors (1).

76072172821 is an equidigital number, since it uses as much as digits as its factorization.

76072172821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131712, while the sum is 43.

Adding to 76072172821 its reverse (12827127067), we get a palindrome (88899299888).

The spelling of 76072172821 in words is "seventy-six billion, seventy-two million, one hundred seventy-two thousand, eight hundred twenty-one".