686835724541 has 4 divisors (see below), whose sum is σ = 693254750112. Its totient is φ = 680416698972.

The previous prime is 686835724537. The next prime is 686835724571. The reversal of 686835724541 is 145427538686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 145427538686 = 2 ⋅72713769343.

It is a cyclic number.

It is not a de Polignac number, because 686835724541 - 2² = 686835724537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686835724571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3209512625 + ... + 3209512838.

It is an arithmetic number, because the mean of its divisors is an integer number (173313687528).

Almost surely, 2^686835724541 is an apocalyptic number.

It is an amenable number.

686835724541 is a deficient number, since it is larger than the sum of its proper divisors (6419025571).

686835724541 is a wasteful number, since it uses less digits than its factorization.

686835724541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419025570.

The product of its digits is 38707200, while the sum is 59.

The spelling of 686835724541 in words is "six hundred eighty-six billion, eight hundred thirty-five million, seven hundred twenty-four thousand, five hundred forty-one".