15540354212 has 12 divisors (see below), whose sum is σ = 27197116800. Its totient is φ = 7769749416.

The previous prime is 15540354199. The next prime is 15540354217. The reversal of 15540354212 is 21245304551.

It is a super-2 number, since 2×15540354212² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15540354217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16712 + ... + 177087.

It is an arithmetic number, because the mean of its divisors is an integer number (2266426400).

Almost surely, 2^15540354212 is an apocalyptic number.

It is an amenable number.

15540354212 is a deficient number, since it is larger than the sum of its proper divisors (11656762588).

15540354212 is a wasteful number, since it uses less digits than its factorization.

15540354212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213850 (or 213848 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 15540354212 its reverse (21245304551), we get a palindrome (36785658763).

The spelling of 15540354212 in words is "fifteen billion, five hundred forty million, three hundred fifty-four thousand, two hundred twelve".