689705631955 has 4 divisors (see below), whose sum is σ = 827646758352. Its totient is φ = 551764505560.

The previous prime is 689705631871. The next prime is 689705631973. The reversal of 689705631955 is 559136507986.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 689705631955 - 2⁹ = 689705631443 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68970563191 + ... + 68970563200.

It is an arithmetic number, because the mean of its divisors is an integer number (206911689588).

Almost surely, 2^689705631955 is an apocalyptic number.

689705631955 is a deficient number, since it is larger than the sum of its proper divisors (137941126397).

689705631955 is a wasteful number, since it uses less digits than its factorization.

689705631955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137941126396.

The product of its (nonzero) digits is 61236000, while the sum is 64.

The spelling of 689705631955 in words is "six hundred eighty-nine billion, seven hundred five million, six hundred thirty-one thousand, nine hundred fifty-five".