27381551060661 has 16 divisors (see below), whose sum is σ = 42295833604224. Its totient is φ = 15432263610624.

The previous prime is 27381551060599. The next prime is 27381551060711. The reversal of 27381551060661 is 16606015518372.

It is not a de Polignac number, because 27381551060661 - 2⁶ = 27381551060597 is a prime.

It is a super-3 number, since 3×27381551060661³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27381551060861) 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, 8930706576 + ... + 8930709641.

It is an arithmetic number, because the mean of its divisors is an integer number (2643489600264).

Almost surely, 2^{27381551060661} is an apocalyptic number.

27381551060661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27381551060661 is a deficient number, since it is larger than the sum of its proper divisors (14914282543563).

27381551060661 is a wasteful number, since it uses less digits than its factorization.

27381551060661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17861416300.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 27381551060661 in words is "twenty-seven trillion, three hundred eighty-one billion, five hundred fifty-one million, sixty thousand, six hundred sixty-one".