1666406553053 has 4 divisors (see below), whose sum is σ = 1817898057888. Its totient is φ = 1514915048220.

The previous prime is 1666406553043. The next prime is 1666406553101. The reversal of 1666406553053 is 3503556046661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1666406553053 - 2¹² = 1666406548957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666406552992 and 1666406553010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666406553043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75745752401 + ... + 75745752422.

It is an arithmetic number, because the mean of its divisors is an integer number (454474514472).

Almost surely, 2^{1666406553053} is an apocalyptic number.

It is an amenable number.

1666406553053 is a deficient number, since it is larger than the sum of its proper divisors (151491504835).

1666406553053 is a wasteful number, since it uses less digits than its factorization.

1666406553053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151491504834.

The product of its (nonzero) digits is 5832000, while the sum is 50.

The spelling of 1666406553053 in words is "one trillion, six hundred sixty-six billion, four hundred six million, five hundred fifty-three thousand, fifty-three".