697952221128 has 180 divisors, whose sum is σ = 2011443619185. Its totient is φ = 226107681984.

The previous prime is 697952221111. The next prime is 697952221157. The reversal of 697952221128 is 821122259796.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

697952221128 is a `hidden beast` number, since 6 + 9 + 79 + 522 + 21 + 1 + 28 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 563103161604 + 134849059524 = 750402^2 + 367218^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=590742.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 44 ways as a sum of consecutive naturals, for example, 786867901 + ... + 786868787.

Almost surely, 2^697952221128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697952221128

697952221128 is an abundant number, since it is smaller than the sum of its proper divisors (1313491398057).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

697952221128 is an frugal number, since it uses more digits than its factorization.

697952221128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866 (or 929 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 697952221128 in words is "six hundred ninety-seven billion, nine hundred fifty-two million, two hundred twenty-one thousand, one hundred twenty-eight".