71811507923 has 2 divisors, whose sum is σ = 71811507924. Its totient is φ = 71811507922.

The previous prime is 71811507907. The next prime is 71811507983. The reversal of 71811507923 is 32970511817.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71811507923 - 2⁴ = 71811507907 is a prime.

It is not a weakly prime, because it can be changed into another prime (71811507983) 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, 35905753961 + 35905753962.

It is an arithmetic number, because the mean of its divisors is an integer number (35905753962).

Almost surely, 2^71811507923 is an apocalyptic number.

71811507923 is a deficient number, since it is larger than the sum of its proper divisors (1).

71811507923 is an equidigital number, since it uses as much as digits as its factorization.

71811507923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 71811507923 in words is "seventy-one billion, eight hundred eleven million, five hundred seven thousand, nine hundred twenty-three".