8005778297 has 6 divisors (see below), whose sum is σ = 8799739914. Its totient is φ = 7277980160.

The previous prime is 8005778279. The next prime is 8005778351. The reversal of 8005778297 is 7928775008.

It can be written as a sum of positive squares in only one way, i.e., 7559259136 + 446519161 = 86944^2 + 21131^2 .

It is not a de Polignac number, because 8005778297 - 2⁶ = 8005778233 is a prime.

It is a super-2 number, since 2×8005778297² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8005772297) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33081608 + ... + 33081849.

It is an arithmetic number, because the mean of its divisors is an integer number (1466623319).

Almost surely, 2^8005778297 is an apocalyptic number.

It is an amenable number.

8005778297 is a deficient number, since it is larger than the sum of its proper divisors (793961617).

8005778297 is a wasteful number, since it uses less digits than its factorization.

8005778297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66163479 (or 66163468 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 53.

The square root of 8005778297 is about 89475.0149315439. The cubic root of 8005778297 is about 2000.4814088635.

The spelling of 8005778297 in words is "eight billion, five million, seven hundred seventy-eight thousand, two hundred ninety-seven".