13661025456666 has 16 divisors (see below), whose sum is σ = 31225201043904. Its totient is φ = 3903150130464.

The previous prime is 13661025456649. The next prime is 13661025456703. The reversal of 13661025456666 is 66665452016631.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162631255395 + ... + 162631255478.

It is an arithmetic number, because the mean of its divisors is an integer number (1951575065244).

Almost surely, 2^{13661025456666} is an apocalyptic number.

13661025456666 is an abundant number, since it is smaller than the sum of its proper divisors (17564175587238).

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

13661025456666 is a wasteful number, since it uses less digits than its factorization.

13661025456666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325262510885.

The product of its (nonzero) digits is 27993600, while the sum is 57.

The spelling of 13661025456666 in words is "thirteen trillion, six hundred sixty-one billion, twenty-five million, four hundred fifty-six thousand, six hundred sixty-six".