6665988542402 has 18 divisors (see below), whose sum is σ = 11631514401747. Its totient is φ = 2856841278564.

The previous prime is 6665988542371. The next prime is 6665988542417. The reversal of 6665988542402 is 2042458895666.

It can be written as a sum of positive squares in only one way, i.e., 3332994271201 + 3332994271201 = 1825649^2 + 1825649^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1825649.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 25428683 + ... + 25689489.

Almost surely, 2^{6665988542402} is an apocalyptic number.

6665988542402 is a deficient number, since it is larger than the sum of its proper divisors (4965525859345).

6665988542402 is an frugal number, since it uses more digits than its factorization.

6665988542402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521630 (or 260816 counting only the distinct ones).

The product of its (nonzero) digits is 199065600, while the sum is 65.

The spelling of 6665988542402 in words is "six trillion, six hundred sixty-five billion, nine hundred eighty-eight million, five hundred forty-two thousand, four hundred two".