74887678813 has 2 divisors, whose sum is σ = 74887678814. Its totient is φ = 74887678812.

The previous prime is 74887678771. The next prime is 74887678849. The reversal of 74887678813 is 31887678847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72833595129 + 2054083684 = 269877^2 + 45322^2 .

It is a cyclic number.

It is not a de Polignac number, because 74887678813 - 2⁹ = 74887678301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74887678213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37443839406 + 37443839407.

It is an arithmetic number, because the mean of its divisors is an integer number (37443839407).

Almost surely, 2^74887678813 is an apocalyptic number.

It is an amenable number.

74887678813 is a deficient number, since it is larger than the sum of its proper divisors (1).

74887678813 is an equidigital number, since it uses as much as digits as its factorization.

74887678813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 101154816, while the sum is 67.

The spelling of 74887678813 in words is "seventy-four billion, eight hundred eighty-seven million, six hundred seventy-eight thousand, eight hundred thirteen".