8121485677 has 2 divisors, whose sum is σ = 8121485678. Its totient is φ = 8121485676.

The previous prime is 8121485653. The next prime is 8121485689. The reversal of 8121485677 is 7765841218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6341573956 + 1779911721 = 79634^2 + 42189^2 .

It is a cyclic number.

It is not a de Polignac number, because 8121485677 - 2¹⁵ = 8121452909 is a prime.

It is a super-2 number, since 2×8121485677² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8121485677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121485627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060742838 + 4060742839.

It is an arithmetic number, because the mean of its divisors is an integer number (4060742839).

Almost surely, 2^8121485677 is an apocalyptic number.

It is an amenable number.

8121485677 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121485677 is an equidigital number, since it uses as much as digits as its factorization.

8121485677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 49.

The square root of 8121485677 is about 90119.2858216264. The cubic root of 8121485677 is about 2010.0729886946.

The spelling of 8121485677 in words is "eight billion, one hundred twenty-one million, four hundred eighty-five thousand, six hundred seventy-seven".