1165566551 has 8 divisors (see below), whose sum is σ = 1203577344. Its totient is φ = 1127581560.

The previous prime is 1165566541. The next prime is 1165566559. The reversal of 1165566551 is 1556655611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165566551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1165566499 and 1165566508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165566559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134780 + ... + 143166.

It is an arithmetic number, because the mean of its divisors is an integer number (150447168).

Almost surely, 2^1165566551 is an apocalyptic number.

1165566551 is a deficient number, since it is larger than the sum of its proper divisors (38010793).

1165566551 is an equidigital number, since it uses as much as digits as its factorization.

1165566551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901.

The product of its digits is 135000, while the sum is 41.

The square root of 1165566551 is about 34140.3947106650. The cubic root of 1165566551 is about 1052.3956038280.

The spelling of 1165566551 in words is "one billion, one hundred sixty-five million, five hundred sixty-six thousand, five hundred fifty-one".