1215556167161 has 16 divisors (see below), whose sum is σ = 1400419345536. Its totient is φ = 1033507718016.

The previous prime is 1215556167143. The next prime is 1215556167191. The reversal of 1215556167161 is 1617616555121.

It is a cyclic number.

It is not a de Polignac number, because 1215556167161 - 2²⁶ = 1215489058297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1215556167191) 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, 768515 + ... + 1738311.

It is an arithmetic number, because the mean of its divisors is an integer number (87526209096).

Almost surely, 2^{1215556167161} is an apocalyptic number.

It is an amenable number.

1215556167161 is a deficient number, since it is larger than the sum of its proper divisors (184863178375).

1215556167161 is a wasteful number, since it uses less digits than its factorization.

1215556167161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971248.

The product of its digits is 378000, while the sum is 47.

The spelling of 1215556167161 in words is "one trillion, two hundred fifteen billion, five hundred fifty-six million, one hundred sixty-seven thousand, one hundred sixty-one".