1611601615564 has 6 divisors (see below), whose sum is σ = 2820302827244. Its totient is φ = 805800807780.

The previous prime is 1611601615543. The next prime is 1611601615567. The reversal of 1611601615564 is 4655161061161.

It is a self number, because there is not a number n which added to its sum of digits gives 1611601615564.

It is not an unprimeable number, because it can be changed into a prime (1611601615567) by changing a digit.

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 as a sum of consecutive naturals, namely, 201450201942 + ... + 201450201949.

Almost surely, 2^{1611601615564} is an apocalyptic number.

It is an amenable number.

1611601615564 is a deficient number, since it is larger than the sum of its proper divisors (1208701211680).

1611601615564 is a wasteful number, since it uses less digits than its factorization.

1611601615564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402900403895 (or 402900403893 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 1611601615564 in words is "one trillion, six hundred eleven billion, six hundred one million, six hundred fifteen thousand, five hundred sixty-four".