1051261166238 has 16 divisors (see below), whose sum is σ = 2102538990720. Its totient is φ = 350417612376.

The previous prime is 1051261166237. The next prime is 1051261166243. The reversal of 1051261166238 is 8326611621501.

It is a super-2 number, since 2×1051261166238² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1051261166238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051261166231) 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, 218631 + ... + 1466397.

It is an arithmetic number, because the mean of its divisors is an integer number (131408686920).

Almost surely, 2^{1051261166238} is an apocalyptic number.

1051261166238 is an abundant number, since it is smaller than the sum of its proper divisors (1051277824482).

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

1051261166238 is a wasteful number, since it uses less digits than its factorization.

1051261166238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388191.

The product of its (nonzero) digits is 103680, while the sum is 42.

Adding to 1051261166238 its reverse (8326611621501), we get a palindrome (9377872787739).

The spelling of 1051261166238 in words is "one trillion, fifty-one billion, two hundred sixty-one million, one hundred sixty-six thousand, two hundred thirty-eight".