685899201955 has 8 divisors (see below), whose sum is σ = 897904409904. Its totient is φ = 498835783200.

The previous prime is 685899201931. The next prime is 685899201991. The reversal of 685899201955 is 559102998586.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685899201955 - 2²¹ = 685897104803 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6235447236 + ... + 6235447345.

It is an arithmetic number, because the mean of its divisors is an integer number (112238051238).

Almost surely, 2^685899201955 is an apocalyptic number.

685899201955 is a deficient number, since it is larger than the sum of its proper divisors (212005207949).

685899201955 is a wasteful number, since it uses less digits than its factorization.

685899201955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12470894597.

The product of its (nonzero) digits is 69984000, while the sum is 67.

The spelling of 685899201955 in words is "six hundred eighty-five billion, eight hundred ninety-nine million, two hundred one thousand, nine hundred fifty-five".