1151055661556 has 24 divisors (see below), whose sum is σ = 2139818604000. Its totient is φ = 540234715104.

The previous prime is 1151055661471. The next prime is 1151055661597. The reversal of 1151055661556 is 6551665501511.

It is a super-2 number, since 2×1151055661556² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1151055661556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69466346 + ... + 69482913.

It is an arithmetic number, because the mean of its divisors is an integer number (89159108500).

Almost surely, 2^{1151055661556} is an apocalyptic number.

It is an amenable number.

1151055661556 is a deficient number, since it is larger than the sum of its proper divisors (988762942444).

1151055661556 is a wasteful number, since it uses less digits than its factorization.

1151055661556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138949391 (or 138949389 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 47.

The spelling of 1151055661556 in words is "one trillion, one hundred fifty-one billion, fifty-five million, six hundred sixty-one thousand, five hundred fifty-six".