1161515505050 has 24 divisors (see below), whose sum is σ = 2182691207676. Its totient is φ = 459816445440.

The previous prime is 1161515505049. The next prime is 1161515505053. The reversal of 1161515505050 is 505055151611.

It can be written as a sum of positive squares in 6 ways, for example, as 312974232481 + 848541272569 = 559441^2 + 921163^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1161515505050.

It is not an unprimeable number, because it can be changed into a prime (1161515505053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119739017 + ... + 119748716.

Almost surely, 2^{1161515505050} is an apocalyptic number.

1161515505050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1161515505050 is a deficient number, since it is larger than the sum of its proper divisors (1021175702626).

1161515505050 is a wasteful number, since it uses less digits than its factorization.

1161515505050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239487842 (or 239487837 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 1161515505050 in words is "one trillion, one hundred sixty-one billion, five hundred fifteen million, five hundred five thousand, fifty".