78485757971 has 2 divisors, whose sum is σ = 78485757972. Its totient is φ = 78485757970.

The previous prime is 78485757923. The next prime is 78485757979. The reversal of 78485757971 is 17975758487.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78485757971 is a prime.

It is not a weakly prime, because it can be changed into another prime (78485757979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39242878985 + 39242878986.

It is an arithmetic number, because the mean of its divisors is an integer number (39242878986).

Almost surely, 2^78485757971 is an apocalyptic number.

78485757971 is a deficient number, since it is larger than the sum of its proper divisors (1).

78485757971 is an equidigital number, since it uses as much as digits as its factorization.

78485757971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138297600, while the sum is 68.

The spelling of 78485757971 in words is "seventy-eight billion, four hundred eighty-five million, seven hundred fifty-seven thousand, nine hundred seventy-one".