686866633 has 4 divisors (see below), whose sum is σ = 687258880. Its totient is φ = 686474388.

The previous prime is 686866619. The next prime is 686866669. The reversal of 686866633 is 336668686.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 686866633 - 2¹³ = 686858441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686861633) 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, 193485 + ... + 197002.

It is an arithmetic number, because the mean of its divisors is an integer number (171814720).

Almost surely, 2^686866633 is an apocalyptic number.

It is an amenable number.

686866633 is a deficient number, since it is larger than the sum of its proper divisors (392247).

686866633 is a wasteful number, since it uses less digits than its factorization.

686866633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392246.

The product of its digits is 4478976, while the sum is 52.

The square root of 686866633 is about 26208.1405864666. The cubic root of 686866633 is about 882.3159695122.

The spelling of 686866633 in words is "six hundred eighty-six million, eight hundred sixty-six thousand, six hundred thirty-three".