1616615651601 has 14 divisors (see below), whose sum is σ = 2423814688610. Its totient is φ = 1077743767248.

The previous prime is 1616615651591. The next prime is 1616615651641. The reversal of 1616615651601 is 1061565166161.

1616615651601 is a `hidden beast` number, since 1 + 6 + 16 + 61 + 565 + 16 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1511866976400 + 104748675201 = 1229580^2 + 323649^2 .

It is not a de Polignac number, because 1616615651601 - 2³¹ = 1614468167953 is a prime.

It is a super-2 number, since 2×1616615651601² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616615651641) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1108789156 + ... + 1108790613.

It is an arithmetic number, because the mean of its divisors is an integer number (173129620615).

Almost surely, 2^{1616615651601} is an apocalyptic number.

It is an amenable number.

1616615651601 is a deficient number, since it is larger than the sum of its proper divisors (807199037009).

1616615651601 is an frugal number, since it uses more digits than its factorization.

1616615651601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217579787 (or 2217579772 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 1616615651601 in words is "one trillion, six hundred sixteen billion, six hundred fifteen million, six hundred fifty-one thousand, six hundred one".