1666554724402 has 16 divisors (see below), whose sum is σ = 2559728381760. Its totient is φ = 813338607312.

The previous prime is 1666554724391. The next prime is 1666554724427. The reversal of 1666554724402 is 2044274556661.

It is a self number, because there is not a number n which added to its sum of digits gives 1666554724402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6543502 + ... + 6793417.

It is an arithmetic number, because the mean of its divisors is an integer number (159983023860).

Almost surely, 2^{1666554724402} is an apocalyptic number.

1666554724402 is a deficient number, since it is larger than the sum of its proper divisors (893173657358).

1666554724402 is a wasteful number, since it uses less digits than its factorization.

1666554724402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13338417.

The product of its (nonzero) digits is 9676800, while the sum is 52.

The spelling of 1666554724402 in words is "one trillion, six hundred sixty-six billion, five hundred fifty-four million, seven hundred twenty-four thousand, four hundred two".