685451464154539 has 2 divisors, whose sum is σ = 685451464154540. Its totient is φ = 685451464154538.

The previous prime is 685451464154461. The next prime is 685451464154603. The reversal of 685451464154539 is 935451464154586.

It is a happy number.

685451464154539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685451464154539 - 2¹⁷ = 685451464023467 is a prime.

It is a super-2 number, since 2×685451464154539² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (685451464154939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342725732077269 + 342725732077270.

It is an arithmetic number, because the mean of its divisors is an integer number (342725732077270).

Almost surely, 2^{685451464154539} is an apocalyptic number.

685451464154539 is a deficient number, since it is larger than the sum of its proper divisors (1).

685451464154539 is an equidigital number, since it uses as much as digits as its factorization.

685451464154539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160000, while the sum is 70.

The spelling of 685451464154539 in words is "six hundred eighty-five trillion, four hundred fifty-one billion, four hundred sixty-four million, one hundred fifty-four thousand, five hundred thirty-nine".