1561655466642 has 16 divisors (see below), whose sum is σ = 3143204635392. Its totient is φ = 517236205200.

The previous prime is 1561655466571. The next prime is 1561655466661. The reversal of 1561655466642 is 2466645561651.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828903234 + ... + 828905117.

It is an arithmetic number, because the mean of its divisors is an integer number (196450289712).

Almost surely, 2^{1561655466642} is an apocalyptic number.

1561655466642 is an abundant number, since it is smaller than the sum of its proper divisors (1581549168750).

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

1561655466642 is a wasteful number, since it uses less digits than its factorization.

1561655466642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657808513.

The product of its digits is 31104000, while the sum is 57.

The spelling of 1561655466642 in words is "one trillion, five hundred sixty-one billion, six hundred fifty-five million, four hundred sixty-six thousand, six hundred forty-two".