1505666166499 has 16 divisors (see below), whose sum is σ = 1652031573120. Its totient is φ = 1360895256000.

The previous prime is 1505666166481. The next prime is 1505666166539. The reversal of 1505666166499 is 9946616665051.

It is a cyclic number.

It is not a de Polignac number, because 1505666166499 - 2⁵ = 1505666166467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1505666166499.

It is not an unprimeable number, because it can be changed into a prime (1505666166409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1919647 + ... + 2587735.

It is an arithmetic number, because the mean of its divisors is an integer number (103251973320).

Almost surely, 2^{1505666166499} is an apocalyptic number.

1505666166499 is a deficient number, since it is larger than the sum of its proper divisors (146365406621).

1505666166499 is a wasteful number, since it uses less digits than its factorization.

1505666166499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669282.

The product of its (nonzero) digits is 62985600, while the sum is 64.

The spelling of 1505666166499 in words is "one trillion, five hundred five billion, six hundred sixty-six million, one hundred sixty-six thousand, four hundred ninety-nine".