1156161066555 has 32 divisors (see below), whose sum is σ = 2031391047168. Its totient is φ = 556850592000.

The previous prime is 1156161066539. The next prime is 1156161066559. The reversal of 1156161066555 is 5556601616511.

It is not a de Polignac number, because 1156161066555 - 2⁴ = 1156161066539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1156161066559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23177194 + ... + 23227023.

It is an arithmetic number, because the mean of its divisors is an integer number (63480970224).

Almost surely, 2^{1156161066555} is an apocalyptic number.

1156161066555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1156161066555 is a deficient number, since it is larger than the sum of its proper divisors (875229980613).

1156161066555 is a wasteful number, since it uses less digits than its factorization.

1156161066555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46404387.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 1156161066555 in words is "one trillion, one hundred fifty-six billion, one hundred sixty-one million, sixty-six thousand, five hundred fifty-five".