15551586436 has 27 divisors (see below), whose sum is σ = 28460493943. Its totient is φ = 7434971720.

The previous prime is 15551586433. The next prime is 15551586497. The reversal of 15551586436 is 63468515551.

It is a happy number.

The square root of 15551586436 is 124706.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15551586436.

It is not an unprimeable number, because it can be changed into a prime (15551586433) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5735121 + ... + 5737831.

Almost surely, 2^15551586436 is an apocalyptic number.

15551586436 is the 124706-th square number.

It is an amenable number.

15551586436 is a deficient number, since it is larger than the sum of its proper divisors (12908907507).

15551586436 is an frugal number, since it uses more digits than its factorization.

15551586436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472 (or 2736 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 49.

Multiplying 15551586436 by its sum of digits (49), we get a square (762027735364 = 872942²).

The spelling of 15551586436 in words is "fifteen billion, five hundred fifty-one million, five hundred eighty-six thousand, four hundred thirty-six".