697947208021 has 16 divisors (see below), whose sum is σ = 805730530176. Its totient is φ = 592191668736.

The previous prime is 697947207967. The next prime is 697947208027. The reversal of 697947208021 is 120802749796.

It is a cyclic number.

It is not a de Polignac number, because 697947208021 - 2¹⁷ = 697947076949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697947208027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 612225 + ... + 1330681.

It is an arithmetic number, because the mean of its divisors is an integer number (50358158136).

Almost surely, 2^697947208021 is an apocalyptic number.

It is an amenable number.

697947208021 is a deficient number, since it is larger than the sum of its proper divisors (107783322155).

697947208021 is a wasteful number, since it uses less digits than its factorization.

697947208021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719868.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 697947208021 in words is "six hundred ninety-seven billion, nine hundred forty-seven million, two hundred eight thousand, twenty-one".