997655888556799 has 8 divisors (see below), whose sum is σ = 1004494438895328. Its totient is φ = 990820385030400.

The previous prime is 997655888556757. The next prime is 997655888556827.

997655888556799 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997655888556799 - 2⁷ = 997655888556671 is a prime.

It is a super-2 number, since 2×997655888556799² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997655888556199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 761045902 + ... + 762355675.

It is an arithmetic number, because the mean of its divisors is an integer number (125561804861916).

Almost surely, 2^{997655888556799} is an apocalyptic number.

997655888556799 is a deficient number, since it is larger than the sum of its proper divisors (6838550338529).

997655888556799 is a wasteful number, since it uses less digits than its factorization.

997655888556799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523406065.

The product of its digits is 3703553280000, while the sum is 106.

The spelling of 997655888556799 in words is "nine hundred ninety-seven trillion, six hundred fifty-five billion, eight hundred eighty-eight million, five hundred fifty-six thousand, seven hundred ninety-nine".