27779158947917 has 16 divisors (see below), whose sum is σ = 30481752370608. Its totient is φ = 25157425512960.

The previous prime is 27779158947907. The next prime is 27779158948067. The reversal of 27779158947917 is 71974985197772.

It can be written as a sum of positive squares in 8 ways, for example, as 6003925984681 + 21775232963236 = 2450291^2 + 4666394^2 .

It is not a de Polignac number, because 27779158947917 - 2¹² = 27779158943821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27779158947907) 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, 15783623 + ... + 17455115.

It is an arithmetic number, because the mean of its divisors is an integer number (1905109523163).

Almost surely, 2^{27779158947917} is an apocalyptic number.

It is an amenable number.

27779158947917 is a deficient number, since it is larger than the sum of its proper divisors (2702593422691).

27779158947917 is a wasteful number, since it uses less digits than its factorization.

27779158947917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695680.

The product of its digits is 3920736960, while the sum is 83.

The spelling of 27779158947917 in words is "twenty-seven trillion, seven hundred seventy-nine billion, one hundred fifty-eight million, nine hundred forty-seven thousand, nine hundred seventeen".