1566501616545 has 8 divisors (see below), whose sum is σ = 2506402586496. Its totient is φ = 835467528816.

The previous prime is 1566501616441. The next prime is 1566501616583. The reversal of 1566501616545 is 5456161056651.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1566501616545 - 2⁸ = 1566501616289 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 52216720537 + ... + 52216720566.

It is an arithmetic number, because the mean of its divisors is an integer number (313300323312).

Almost surely, 2^{1566501616545} is an apocalyptic number.

1566501616545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1566501616545 is a deficient number, since it is larger than the sum of its proper divisors (939900969951).

1566501616545 is a wasteful number, since it uses less digits than its factorization.

1566501616545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104433441111.

The product of its (nonzero) digits is 3240000, while the sum is 51.

The spelling of 1566501616545 in words is "one trillion, five hundred sixty-six billion, five hundred one million, six hundred sixteen thousand, five hundred forty-five".