27770012861 has 16 divisors (see below), whose sum is σ = 28196866368. Its totient is φ = 27347174400.

The previous prime is 27770012833. The next prime is 27770012957. The reversal of 27770012861 is 16821007772.

It is a cyclic number.

It is not a de Polignac number, because 27770012861 - 2¹⁸ = 27769750717 is a prime.

It is a super-3 number, since 3×27770012861³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27770011861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12412835 + ... + 12415071.

It is an arithmetic number, because the mean of its divisors is an integer number (1762304148).

Almost surely, 2^27770012861 is an apocalyptic number.

It is an amenable number.

27770012861 is a deficient number, since it is larger than the sum of its proper divisors (426853507).

27770012861 is a wasteful number, since it uses less digits than its factorization.

27770012861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052.

The product of its (nonzero) digits is 65856, while the sum is 41.

The spelling of 27770012861 in words is "twenty-seven billion, seven hundred seventy million, twelve thousand, eight hundred sixty-one".