71800977427 has 2 divisors, whose sum is σ = 71800977428. Its totient is φ = 71800977426.

The previous prime is 71800977407. The next prime is 71800977431. The reversal of 71800977427 is 72477900817.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71800977427 - 2⁷ = 71800977299 is a prime.

It is not a weakly prime, because it can be changed into another prime (71800977407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35900488713 + 35900488714.

It is an arithmetic number, because the mean of its divisors is an integer number (35900488714).

Almost surely, 2^71800977427 is an apocalyptic number.

71800977427 is a deficient number, since it is larger than the sum of its proper divisors (1).

71800977427 is an equidigital number, since it uses as much as digits as its factorization.

71800977427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382976, while the sum is 52.

The spelling of 71800977427 in words is "seventy-one billion, eight hundred million, nine hundred seventy-seven thousand, four hundred twenty-seven".