1616051661 has 16 divisors (see below), whose sum is σ = 2497241088. Its totient is φ = 910450800.

The previous prime is 1616051659. The next prime is 1616051677. The reversal of 1616051661 is 1661506161.

It is not a de Polignac number, because 1616051661 - 2¹ = 1616051659 is a prime.

It is a super-2 number, since 2×1616051661² = 5223245942041717842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616051621) 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 15 ways as a sum of consecutive naturals, for example, 540445 + ... + 543426.

It is an arithmetic number, because the mean of its divisors is an integer number (156077568).

Almost surely, 2^1616051661 is an apocalyptic number.

It is an amenable number.

1616051661 is a deficient number, since it is larger than the sum of its proper divisors (881189427).

1616051661 is a wasteful number, since it uses less digits than its factorization.

1616051661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083952.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1616051661 is about 40200.1450370518. The cubic root of 1616051661 is about 1173.5053664676.

The spelling of 1616051661 in words is "one billion, six hundred sixteen million, fifty-one thousand, six hundred sixty-one".