78900485569 has 2 divisors, whose sum is σ = 78900485570. Its totient is φ = 78900485568.

The previous prime is 78900485551. The next prime is 78900485579. The reversal of 78900485569 is 96558400987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70962566544 + 7937919025 = 266388^2 + 89095^2 .

It is a cyclic number.

It is not a de Polignac number, because 78900485569 - 2²⁹ = 78363614657 is a prime.

It is a super-2 number, since 2×78900485569² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78900485509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39450242784 + 39450242785.

It is an arithmetic number, because the mean of its divisors is an integer number (39450242785).

Almost surely, 2^78900485569 is an apocalyptic number.

It is an amenable number.

78900485569 is a deficient number, since it is larger than the sum of its proper divisors (1).

78900485569 is an equidigital number, since it uses as much as digits as its factorization.

78900485569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 78900485569 in words is "seventy-eight billion, nine hundred million, four hundred eighty-five thousand, five hundred sixty-nine".