16555665061 has 4 divisors (see below), whose sum is σ = 17829177772. Its totient is φ = 15282152352.

The previous prime is 16555665043. The next prime is 16555665079. The reversal of 16555665061 is 16056655561.

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

It is an interprime number because it is at equal distance from previous prime (16555665043) and next prime (16555665079).

It can be written as a sum of positive squares in 2 ways, for example, as 3092472100 + 13463192961 = 55610^2 + 116031^2 .

It is a cyclic number.

It is not a de Polignac number, because 16555665061 - 2¹⁵ = 16555632293 is a prime.

It is a super-2 number, since 2×16555665061² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555662061) 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, 636756336 + ... + 636756361.

It is an arithmetic number, because the mean of its divisors is an integer number (4457294443).

Almost surely, 2^16555665061 is an apocalyptic number.

It is an amenable number.

16555665061 is a deficient number, since it is larger than the sum of its proper divisors (1273512711).

16555665061 is a wasteful number, since it uses less digits than its factorization.

16555665061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273512710.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 16555665061 in words is "sixteen billion, five hundred fifty-five million, six hundred sixty-five thousand, sixty-one".