27991874211807 has 32 divisors (see below), whose sum is σ = 42791343114240. Its totient is φ = 16110431140320.

The previous prime is 27991874211803. The next prime is 27991874211811. The reversal of 27991874211807 is 70811247819972.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27991874211803) and next prime (27991874211811).

It is not a de Polignac number, because 27991874211807 - 2² = 27991874211803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27991874211803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132556153 + ... + 132767154.

It is an arithmetic number, because the mean of its divisors is an integer number (1337229472320).

Almost surely, 2^{27991874211807} is an apocalyptic number.

27991874211807 is a deficient number, since it is larger than the sum of its proper divisors (14799468902433).

27991874211807 is a wasteful number, since it uses less digits than its factorization.

27991874211807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265323483.

The product of its (nonzero) digits is 28449792, while the sum is 66.

The spelling of 27991874211807 in words is "twenty-seven trillion, nine hundred ninety-one billion, eight hundred seventy-four million, two hundred eleven thousand, eight hundred seven".