166503201634653 has 32 divisors (see below), whose sum is σ = 255989466633600. Its totient is φ = 95352690149376.

The previous prime is 166503201634501. The next prime is 166503201634667. The reversal of 166503201634653 is 356436102305661.

It is not a de Polignac number, because 166503201634653 - 2²⁹ = 166502664763741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 166503201634596 and 166503201634605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166503201644653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1410817683 + ... + 1410935696.

It is an arithmetic number, because the mean of its divisors is an integer number (7999670832300).

Almost surely, 2^{166503201634653} is an apocalyptic number.

166503201634653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166503201634653 is a deficient number, since it is larger than the sum of its proper divisors (89486264998947).

166503201634653 is a wasteful number, since it uses less digits than its factorization.

166503201634653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821753501.

The product of its (nonzero) digits is 6998400, while the sum is 51.

The spelling of 166503201634653 in words is "one hundred sixty-six trillion, five hundred three billion, two hundred one million, six hundred thirty-four thousand, six hundred fifty-three".