815534154140 has 12 divisors (see below), whose sum is σ = 1712621723736. Its totient is φ = 326213661648.

The previous prime is 815534154137. The next prime is 815534154173. The reversal of 815534154140 is 41451435518.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 20388353834 + ... + 20388353873.

It is an arithmetic number, because the mean of its divisors is an integer number (142718476978).

Almost surely, 2^815534154140 is an apocalyptic number.

It is an amenable number.

815534154140 is an abundant number, since it is smaller than the sum of its proper divisors (897087569596).

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

815534154140 is a wasteful number, since it uses less digits than its factorization.

815534154140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40776707716 (or 40776707714 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 41.

Adding to 815534154140 its reverse (41451435518), we get a palindrome (856985589658).

The spelling of 815534154140 in words is "eight hundred fifteen billion, five hundred thirty-four million, one hundred fifty-four thousand, one hundred forty".