1000655161661 has 4 divisors (see below), whose sum is σ = 1059517230012. Its totient is φ = 941793093312.

The previous prime is 1000655161651. The next prime is 1000655161697. The reversal of 1000655161661 is 1661615560001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 688392133636 + 312263028025 = 829694^2 + 558805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000655161661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000655161631) 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, 29431034150 + ... + 29431034183.

It is an arithmetic number, because the mean of its divisors is an integer number (264879307503).

Almost surely, 2^{1000655161661} is an apocalyptic number.

It is an amenable number.

1000655161661 is a deficient number, since it is larger than the sum of its proper divisors (58862068351).

1000655161661 is an equidigital number, since it uses as much as digits as its factorization.

1000655161661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58862068350.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 1000655161661 in words is "one trillion, six hundred fifty-five million, one hundred sixty-one thousand, six hundred sixty-one".