1616152151561 has 4 divisors (see below), whose sum is σ = 1617106761732. Its totient is φ = 1615197541392.

The previous prime is 1616152151533. The next prime is 1616152151609. The reversal of 1616152151561 is 1651512516161.

It is a happy number.

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 439892603536 + 1176259548025 = 663244^2 + 1084555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616152151561 - 2¹⁴ = 1616152135177 is a prime.

It is a super-2 number, since 2×1616152151561² (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 (1616152451561) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 477302546 + ... + 477305931.

It is an arithmetic number, because the mean of its divisors is an integer number (404276690433).

Almost surely, 2^{1616152151561} is an apocalyptic number.

It is an amenable number.

1616152151561 is a deficient number, since it is larger than the sum of its proper divisors (954610171).

1616152151561 is an equidigital number, since it uses as much as digits as its factorization.

1616152151561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954610170.

The product of its digits is 54000, while the sum is 41.

The spelling of 1616152151561 in words is "one trillion, six hundred sixteen billion, one hundred fifty-two million, one hundred fifty-one thousand, five hundred sixty-one".