1156161066556 has 12 divisors (see below), whose sum is σ = 2088549023680. Its totient is φ = 559432774080.

The previous prime is 1156161066539. The next prime is 1156161066559. The reversal of 1156161066556 is 6556601616511.

It is a super-2 number, since 2×1156161066556² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4661939661 + ... + 4661939908.

Almost surely, 2^{1156161066556} is an apocalyptic number.

It is an amenable number.

1156161066556 is a deficient number, since it is larger than the sum of its proper divisors (932387957124).

1156161066556 is a wasteful number, since it uses less digits than its factorization.

1156161066556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323879604 (or 9323879602 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 1156161066556 in words is "one trillion, one hundred fifty-six billion, one hundred sixty-one million, sixty-six thousand, five hundred fifty-six".