71540830993 has 2 divisors, whose sum is σ = 71540830994. Its totient is φ = 71540830992.

The previous prime is 71540830931. The next prime is 71540831041. The reversal of 71540830993 is 39903804517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60913695249 + 10627135744 = 246807^2 + 103088^2 .

It is an emirp because it is prime and its reverse (39903804517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71540830993 - 2³³ = 62950896401 is a prime.

It is not a weakly prime, because it can be changed into another prime (71540830393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35770415496 + 35770415497.

It is an arithmetic number, because the mean of its divisors is an integer number (35770415497).

Almost surely, 2^71540830993 is an apocalyptic number.

It is an amenable number.

71540830993 is a deficient number, since it is larger than the sum of its proper divisors (1).

71540830993 is an equidigital number, since it uses as much as digits as its factorization.

71540830993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 71540830993 in words is "seventy-one billion, five hundred forty million, eight hundred thirty thousand, nine hundred ninety-three".