1161629813881 has 2 divisors, whose sum is σ = 1161629813882. Its totient is φ = 1161629813880.

The previous prime is 1161629813873. The next prime is 1161629813899. The reversal of 1161629813881 is 1883189261611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1023569264656 + 138060549225 = 1011716^2 + 371565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161629813881 - 2³ = 1161629813873 is a prime.

It is a super-2 number, since 2×1161629813881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1161629813581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580814906940 + 580814906941.

It is an arithmetic number, because the mean of its divisors is an integer number (580814906941).

Almost surely, 2^{1161629813881} is an apocalyptic number.

It is an amenable number.

1161629813881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161629813881 is an equidigital number, since it uses as much as digits as its factorization.

1161629813881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 55.

The spelling of 1161629813881 in words is "one trillion, one hundred sixty-one billion, six hundred twenty-nine million, eight hundred thirteen thousand, eight hundred eighty-one".