78734139571 has 2 divisors, whose sum is σ = 78734139572. Its totient is φ = 78734139570.

The previous prime is 78734139527. The next prime is 78734139587. The reversal of 78734139571 is 17593143787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78734139571 - 2¹¹ = 78734137523 is a prime.

It is not a weakly prime, because it can be changed into another prime (78734139271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39367069785 + 39367069786.

It is an arithmetic number, because the mean of its divisors is an integer number (39367069786).

Almost surely, 2^78734139571 is an apocalyptic number.

78734139571 is a deficient number, since it is larger than the sum of its proper divisors (1).

78734139571 is an equidigital number, since it uses as much as digits as its factorization.

78734139571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 55.

The spelling of 78734139571 in words is "seventy-eight billion, seven hundred thirty-four million, one hundred thirty-nine thousand, five hundred seventy-one".