71551783379 has 2 divisors, whose sum is σ = 71551783380. Its totient is φ = 71551783378.

The previous prime is 71551783349. The next prime is 71551783421. The reversal of 71551783379 is 97338715517.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71551783379 is a prime.

It is not a weakly prime, because it can be changed into another prime (71551783319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35775891689 + 35775891690.

It is an arithmetic number, because the mean of its divisors is an integer number (35775891690).

Almost surely, 2^71551783379 is an apocalyptic number.

71551783379 is a deficient number, since it is larger than the sum of its proper divisors (1).

71551783379 is an equidigital number, since it uses as much as digits as its factorization.

71551783379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5556600, while the sum is 56.

The spelling of 71551783379 in words is "seventy-one billion, five hundred fifty-one million, seven hundred eighty-three thousand, three hundred seventy-nine".