1565155661000 has 64 divisors (see below), whose sum is σ = 3696693137280. Its totient is φ = 620211172800.

The previous prime is 1565155660963. The next prime is 1565155661039. The reversal of 1565155661000 is 1665515651.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7206812 + ... + 7420811.

It is an arithmetic number, because the mean of its divisors is an integer number (57760830270).

Almost surely, 2^{1565155661000} is an apocalyptic number.

1565155661000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1565155661000 is an abundant number, since it is smaller than the sum of its proper divisors (2131537476280).

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

1565155661000 is a wasteful number, since it uses less digits than its factorization.

1565155661000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14627751 (or 14627737 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 1565155661000 in words is "one trillion, five hundred sixty-five billion, one hundred fifty-five million, six hundred sixty-one thousand".