1161661165642 has 16 divisors (see below), whose sum is σ = 1794052442952. Its totient is φ = 563787508480.

The previous prime is 1161661165633. The next prime is 1161661165649. The reversal of 1161661165642 is 2465611661611.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1123343494641 + 38317671001 = 1059879^2 + 195749^2 .

It is a super-2 number, since 2×1161661165642² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1161661165592 and 1161661165601.

It is not an unprimeable number, because it can be changed into a prime (1161661165649) 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, 35939683 + ... + 35971990.

Almost surely, 2^{1161661165642} is an apocalyptic number.

1161661165642 is a deficient number, since it is larger than the sum of its proper divisors (632391277310).

1161661165642 is a wasteful number, since it uses less digits than its factorization.

1161661165642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71911913.

The product of its digits is 311040, while the sum is 46.

The spelling of 1161661165642 in words is "one trillion, one hundred sixty-one billion, six hundred sixty-one million, one hundred sixty-five thousand, six hundred forty-two".