678416947501 has 2 divisors, whose sum is σ = 678416947502. Its totient is φ = 678416947500.

The previous prime is 678416947469. The next prime is 678416947591. The reversal of 678416947501 is 105749614876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666590602500 + 11826345001 = 816450^2 + 108749^2 .

It is a cyclic number.

It is not a de Polignac number, because 678416947501 - 2⁵ = 678416947469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678416947591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339208473750 + 339208473751.

It is an arithmetic number, because the mean of its divisors is an integer number (339208473751).

Almost surely, 2^678416947501 is an apocalyptic number.

It is an amenable number.

678416947501 is a deficient number, since it is larger than the sum of its proper divisors (1).

678416947501 is an equidigital number, since it uses as much as digits as its factorization.

678416947501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 678416947501 in words is "six hundred seventy-eight billion, four hundred sixteen million, nine hundred forty-seven thousand, five hundred one".