78416661487 has 2 divisors, whose sum is σ = 78416661488. Its totient is φ = 78416661486.

The previous prime is 78416661469. The next prime is 78416661523.

It is a happy number.

78416661487 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78416661487 is a prime.

It is a super-2 number, since 2×78416661487² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78416661457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39208330743 + 39208330744.

It is an arithmetic number, because the mean of its divisors is an integer number (39208330744).

Almost surely, 2^78416661487 is an apocalyptic number.

78416661487 is a deficient number, since it is larger than the sum of its proper divisors (1).

78416661487 is an equidigital number, since it uses as much as digits as its factorization.

78416661487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10838016, while the sum is 58.

The spelling of 78416661487 in words is "seventy-eight billion, four hundred sixteen million, six hundred sixty-one thousand, four hundred eighty-seven".