15555489412 has 12 divisors (see below), whose sum is σ = 27224937180. Its totient is φ = 7776935936.

The previous prime is 15555489409. The next prime is 15555489437. The reversal of 15555489412 is 21498455551.

It can be written as a sum of positive squares in 2 ways, for example, as 10785653316 + 4769836096 = 103854^2 + 69064^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157837 + ... + 236692.

It is an arithmetic number, because the mean of its divisors is an integer number (2268744765).

Almost surely, 2^15555489412 is an apocalyptic number.

It is an amenable number.

15555489412 is a deficient number, since it is larger than the sum of its proper divisors (11669447768).

15555489412 is a wasteful number, since it uses less digits than its factorization.

15555489412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404390 (or 404388 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 49.

The spelling of 15555489412 in words is "fifteen billion, five hundred fifty-five million, four hundred eighty-nine thousand, four hundred twelve".