690171686855 has 16 divisors (see below), whose sum is σ = 947514417984. Its totient is φ = 472763961600.

The previous prime is 690171686797. The next prime is 690171686903. The reversal of 690171686855 is 558686171096.

It is not a de Polignac number, because 690171686855 - 2¹⁰ = 690171685831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10312496 + ... + 10379205.

It is an arithmetic number, because the mean of its divisors is an integer number (59219651124).

Almost surely, 2^690171686855 is an apocalyptic number.

690171686855 is a deficient number, since it is larger than the sum of its proper divisors (257342731129).

690171686855 is a wasteful number, since it uses less digits than its factorization.

690171686855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20692666.

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 690171686855 in words is "six hundred ninety billion, one hundred seventy-one million, six hundred eighty-six thousand, eight hundred fifty-five".