27821706545 has 8 divisors (see below), whose sum is σ = 34837615296. Its totient is φ = 21289653616.

The previous prime is 27821706503. The next prime is 27821706547. The reversal of 27821706545 is 54560712872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27821706545 - 2²² = 27817512241 is a prime.

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 27821706545.

It is not an unprimeable number, because it can be changed into a prime (27821706547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120963827 + ... + 120964056.

It is an arithmetic number, because the mean of its divisors is an integer number (4354701912).

Almost surely, 2^27821706545 is an apocalyptic number.

It is an amenable number.

27821706545 is a deficient number, since it is larger than the sum of its proper divisors (7015908751).

27821706545 is a wasteful number, since it uses less digits than its factorization.

27821706545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241927911.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 27821706545 in words is "twenty-seven billion, eight hundred twenty-one million, seven hundred six thousand, five hundred forty-five".