1087171820538 has 16 divisors (see below), whose sum is σ = 2288782780320. Its totient is φ = 343317416976.

The previous prime is 1087171820533. The next prime is 1087171820563. The reversal of 1087171820538 is 8350281717801.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1087171820533) 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, 4768297345 + ... + 4768297572.

It is an arithmetic number, because the mean of its divisors is an integer number (143048923770).

Almost surely, 2^{1087171820538} is an apocalyptic number.

1087171820538 is an abundant number, since it is smaller than the sum of its proper divisors (1201610959782).

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

1087171820538 is a wasteful number, since it uses less digits than its factorization.

1087171820538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9536594941.

The product of its (nonzero) digits is 752640, while the sum is 51.

The spelling of 1087171820538 in words is "one trillion, eighty-seven billion, one hundred seventy-one million, eight hundred twenty thousand, five hundred thirty-eight".