1215607161566 has 16 divisors (see below), whose sum is σ = 2083922606304. Its totient is φ = 520968344064.

The previous prime is 1215607161563. The next prime is 1215607161619. The reversal of 1215607161566 is 6651617065121.

It is a self number, because there is not a number n which added to its sum of digits gives 1215607161566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215607161563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837326 + ... + 1769838.

It is an arithmetic number, because the mean of its divisors is an integer number (130245162894).

Almost surely, 2^{1215607161566} is an apocalyptic number.

1215607161566 is a deficient number, since it is larger than the sum of its proper divisors (868315444738).

1215607161566 is an equidigital number, since it uses as much as digits as its factorization.

1215607161566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025635.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 1215607161566 in words is "one trillion, two hundred fifteen billion, six hundred seven million, one hundred sixty-one thousand, five hundred sixty-six".