15666454340 has 12 divisors (see below), whose sum is σ = 32899554156. Its totient is φ = 6266581728.

The previous prime is 15666454339. The next prime is 15666454343. The reversal of 15666454340 is 4345466651.

It can be written as a sum of positive squares in 2 ways, for example, as 9507030016 + 6159424324 = 97504^2 + 78482^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15666454291 and 15666454300.

It is not an unprimeable number, because it can be changed into a prime (15666454343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391661339 + ... + 391661378.

It is an arithmetic number, because the mean of its divisors is an integer number (2741629513).

Almost surely, 2^15666454340 is an apocalyptic number.

15666454340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15666454340 is an abundant number, since it is smaller than the sum of its proper divisors (17233099816).

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

15666454340 is a wasteful number, since it uses less digits than its factorization.

15666454340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783322726 (or 783322724 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 15666454340 in words is "fifteen billion, six hundred sixty-six million, four hundred fifty-four thousand, three hundred forty".