78557461547 has 2 divisors, whose sum is σ = 78557461548. Its totient is φ = 78557461546.

The previous prime is 78557461519. The next prime is 78557461583. The reversal of 78557461547 is 74516475587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78557461547 - 2⁶ = 78557461483 is a prime.

It is not a weakly prime, because it can be changed into another prime (78557461747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39278730773 + 39278730774.

It is an arithmetic number, because the mean of its divisors is an integer number (39278730774).

Almost surely, 2^78557461547 is an apocalyptic number.

78557461547 is a deficient number, since it is larger than the sum of its proper divisors (1).

78557461547 is an equidigital number, since it uses as much as digits as its factorization.

78557461547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928000, while the sum is 59.

The spelling of 78557461547 in words is "seventy-eight billion, five hundred fifty-seven million, four hundred sixty-one thousand, five hundred forty-seven".