27565050981 has 16 divisors (see below), whose sum is σ = 39720462656. Its totient is φ = 16903161216.

The previous prime is 27565050977. The next prime is 27565051037. The reversal of 27565050981 is 18905056572.

It is a happy number.

It is not a de Polignac number, because 27565050981 - 2² = 27565050977 is a prime.

It is a super-2 number, since 2×27565050981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27565050981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27565050481) 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, 1237720 + ... + 1259793.

It is an arithmetic number, because the mean of its divisors is an integer number (2482528916).

Almost surely, 2^27565050981 is an apocalyptic number.

It is an amenable number.

27565050981 is a deficient number, since it is larger than the sum of its proper divisors (12155411675).

27565050981 is a wasteful number, since it uses less digits than its factorization.

27565050981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497812.

The product of its (nonzero) digits is 756000, while the sum is 48.

The spelling of 27565050981 in words is "twenty-seven billion, five hundred sixty-five million, fifty thousand, nine hundred eighty-one".