689724145547 has 2 divisors, whose sum is σ = 689724145548. Its totient is φ = 689724145546.

The previous prime is 689724145507. The next prime is 689724145609. The reversal of 689724145547 is 745541427986.

689724145547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (689724145609) can be obtained adding 689724145547 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689724145547 - 2³² = 685429178251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689724145547.

It is not a weakly prime, because it can be changed into another prime (689724145507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344862072773 + 344862072774.

It is an arithmetic number, because the mean of its divisors is an integer number (344862072774).

Almost surely, 2^689724145547 is an apocalyptic number.

689724145547 is a deficient number, since it is larger than the sum of its proper divisors (1).

689724145547 is an equidigital number, since it uses as much as digits as its factorization.

689724145547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67737600, while the sum is 62.

The spelling of 689724145547 in words is "six hundred eighty-nine billion, seven hundred twenty-four million, one hundred forty-five thousand, five hundred forty-seven".