1181265390538 has 8 divisors (see below), whose sum is σ = 1848937133088. Its totient is φ = 564953012844.

The previous prime is 1181265390533. The next prime is 1181265390563. The reversal of 1181265390538 is 8350935621811.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1181265390533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12839841156 + ... + 12839841247.

It is an arithmetic number, because the mean of its divisors is an integer number (231117141636).

Almost surely, 2^{1181265390538} is an apocalyptic number.

1181265390538 is a deficient number, since it is larger than the sum of its proper divisors (667671742550).

1181265390538 is a wasteful number, since it uses less digits than its factorization.

1181265390538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25679682428.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 1181265390538 in words is "one trillion, one hundred eighty-one billion, two hundred sixty-five million, three hundred ninety thousand, five hundred thirty-eight".