1161255665447 has 16 divisors (see below), whose sum is σ = 1241693586432. Its totient is φ = 1082168657280.

The previous prime is 1161255665407. The next prime is 1161255665467. The reversal of 1161255665447 is 7445665521611.

It is not a de Polignac number, because 1161255665447 - 2³⁴ = 1144075796263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161255665407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12151622 + ... + 12246812.

It is an arithmetic number, because the mean of its divisors is an integer number (77605849152).

Almost surely, 2^{1161255665447} is an apocalyptic number.

1161255665447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1161255665447 is a deficient number, since it is larger than the sum of its proper divisors (80437920985).

1161255665447 is a wasteful number, since it uses less digits than its factorization.

1161255665447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102278.

The product of its digits is 6048000, while the sum is 53.

The spelling of 1161255665447 in words is "one trillion, one hundred sixty-one billion, two hundred fifty-five million, six hundred sixty-five thousand, four hundred forty-seven".