1566011061540 has 36 divisors (see below), whose sum is σ = 4750233553884. Its totient is φ = 417602949696.

The previous prime is 1566011061487. The next prime is 1566011061547. The reversal of 1566011061540 is 451601106651.

1566011061540 is a `hidden beast` number, since 1 + 5 + 6 + 6 + 0 + 1 + 106 + 1 + 540 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 836083469376 + 729927592164 = 914376^2 + 854358^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1566011061495 and 1566011061504.

It is not an unprimeable number, because it can be changed into a prime (1566011061547) 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 11 ways as a sum of consecutive naturals, for example, 4350030547 + ... + 4350030906.

Almost surely, 2^{1566011061540} is an apocalyptic number.

1566011061540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566011061540 is an abundant number, since it is smaller than the sum of its proper divisors (3184222492344).

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

1566011061540 is a wasteful number, since it uses less digits than its factorization.

1566011061540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8700061468 (or 8700061463 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 1566011061540 in words is "one trillion, five hundred sixty-six billion, eleven million, sixty-one thousand, five hundred forty".