1231165550376 has 160 divisors (see below), whose sum is σ = 3498828686760. Its totient is φ = 404397785088.

The previous prime is 1231165550369. The next prime is 1231165550431. The reversal of 1231165550376 is 6730555611321.

1231165550376 is a `hidden beast` number, since 1 + 2 + 3 + 1 + 1 + 65 + 550 + 37 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 969968916900 + 261196633476 = 984870^2 + 511074^2 .

It is a super-2 number, since 2×1231165550376² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 54530226 + ... + 54552798.

Almost surely, 2^{1231165550376} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231165550376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1749414343380).

1231165550376 is an abundant number, since it is smaller than the sum of its proper divisors (2267663136384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231165550376 is a wasteful number, since it uses less digits than its factorization.

1231165550376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23817 (or 23804 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 1231165550376 in words is "one trillion, two hundred thirty-one billion, one hundred sixty-five million, five hundred fifty thousand, three hundred seventy-six".