78554492969 has 2 divisors, whose sum is σ = 78554492970. Its totient is φ = 78554492968.

The previous prime is 78554492941. The next prime is 78554492987. The reversal of 78554492969 is 96929445587.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59389690000 + 19164802969 = 243700^2 + 138437^2 .

It is a cyclic number.

It is not a de Polignac number, because 78554492969 - 2³² = 74259525673 is a prime.

It is a super-2 number, since 2×78554492969² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78554492899 and 78554492908.

It is not a weakly prime, because it can be changed into another prime (78554492909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39277246484 + 39277246485.

It is an arithmetic number, because the mean of its divisors is an integer number (39277246485).

Almost surely, 2^78554492969 is an apocalyptic number.

It is an amenable number.

78554492969 is a deficient number, since it is larger than the sum of its proper divisors (1).

78554492969 is an equidigital number, since it uses as much as digits as its factorization.

78554492969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 195955200, while the sum is 68.

The spelling of 78554492969 in words is "seventy-eight billion, five hundred fifty-four million, four hundred ninety-two thousand, nine hundred sixty-nine".