1161729126478 has 4 divisors (see below), whose sum is σ = 1742593689720. Its totient is φ = 580864563238.

The previous prime is 1161729126469. The next prime is 1161729126491. The reversal of 1161729126478 is 8746219271611.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1161729126478² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290432281618 + ... + 290432281621.

It is an arithmetic number, because the mean of its divisors is an integer number (435648422430).

Almost surely, 2^{1161729126478} is an apocalyptic number.

1161729126478 is a deficient number, since it is larger than the sum of its proper divisors (580864563242).

1161729126478 is an equidigital number, since it uses as much as digits as its factorization.

1161729126478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580864563241.

The product of its digits is 2032128, while the sum is 55.

The spelling of 1161729126478 in words is "one trillion, one hundred sixty-one billion, seven hundred twenty-nine million, one hundred twenty-six thousand, four hundred seventy-eight".