695139866421 has 128 divisors (see below), whose sum is σ = 1311721205760. Its totient is φ = 315361382400.

The previous prime is 695139866417. The next prime is 695139866453. The reversal of 695139866421 is 124668931596.

It is not a de Polignac number, because 695139866421 - 2² = 695139866417 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (695139866401) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 44097181 + ... + 44112941.

It is an arithmetic number, because the mean of its divisors is an integer number (10247821920).

Almost surely, 2^695139866421 is an apocalyptic number.

It is an amenable number.

695139866421 is a deficient number, since it is larger than the sum of its proper divisors (616581339339).

695139866421 is a wasteful number, since it uses less digits than its factorization.

695139866421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16587.

The product of its digits is 16796160, while the sum is 60.

The spelling of 695139866421 in words is "six hundred ninety-five billion, one hundred thirty-nine million, eight hundred sixty-six thousand, four hundred twenty-one".