1165720551516 has 144 divisors (see below), whose sum is σ = 3143790625248. Its totient is φ = 362938060800.

The previous prime is 1165720551469. The next prime is 1165720551547. The reversal of 1165720551516 is 6151550275611.

1165720551516 is a `hidden beast` number, since 1 + 1 + 6 + 572 + 0 + 55 + 15 + 16 = 666.

It is a super-5 number, since 5×1165720551516⁵ (a number of 62 digits) contains 55555 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54378336 + ... + 54399768.

It is an arithmetic number, because the mean of its divisors is an integer number (21831879342).

Almost surely, 2^{1165720551516} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165720551516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1571895312624).

1165720551516 is an abundant number, since it is smaller than the sum of its proper divisors (1978070073732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1165720551516 is a wasteful number, since it uses less digits than its factorization.

1165720551516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22132 (or 22127 counting only the distinct ones).

The product of its (nonzero) digits is 315000, while the sum is 45.

The spelling of 1165720551516 in words is "one trillion, one hundred sixty-five billion, seven hundred twenty million, five hundred fifty-one thousand, five hundred sixteen".