76721363377 has 2 divisors, whose sum is σ = 76721363378. Its totient is φ = 76721363376.

The previous prime is 76721363353. The next prime is 76721363417. The reversal of 76721363377 is 77336312767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49433296896 + 27288066481 = 222336^2 + 165191^2 .

It is a cyclic number.

It is not a de Polignac number, because 76721363377 - 2¹¹ = 76721361329 is a prime.

It is not a weakly prime, because it can be changed into another prime (76721363777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38360681688 + 38360681689.

It is an arithmetic number, because the mean of its divisors is an integer number (38360681689).

Almost surely, 2^76721363377 is an apocalyptic number.

It is an amenable number.

76721363377 is a deficient number, since it is larger than the sum of its proper divisors (1).

76721363377 is an equidigital number, since it uses as much as digits as its factorization.

76721363377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4667544, while the sum is 52.

The spelling of 76721363377 in words is "seventy-six billion, seven hundred twenty-one million, three hundred sixty-three thousand, three hundred seventy-seven".