78103451971 has 2 divisors, whose sum is σ = 78103451972. Its totient is φ = 78103451970.

The previous prime is 78103451969. The next prime is 78103452001. The reversal of 78103451971 is 17915430187.

It is a weak prime.

It is an emirp because it is prime and its reverse (17915430187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78103451971 - 2¹ = 78103451969 is a prime.

It is a super-2 number, since 2×78103451971² (a number of 23 digits) contains 22 as substring.

Together with 78103451969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78103451941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39051725985 + 39051725986.

It is an arithmetic number, because the mean of its divisors is an integer number (39051725986).

Almost surely, 2^78103451971 is an apocalyptic number.

78103451971 is a deficient number, since it is larger than the sum of its proper divisors (1).

78103451971 is an equidigital number, since it uses as much as digits as its factorization.

78103451971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 46.

The spelling of 78103451971 in words is "seventy-eight billion, one hundred three million, four hundred fifty-one thousand, nine hundred seventy-one".