78495553 has 2 divisors, whose sum is σ = 78495554. Its totient is φ = 78495552.

The previous prime is 78495533. The next prime is 78495559. The reversal of 78495553 is 35559487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65011969 + 13483584 = 8063^2 + 3672^2 .

It is an emirp because it is prime and its reverse (35559487) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78495553 is a prime.

It is not a weakly prime, because it can be changed into another prime (78495559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39247776 + 39247777.

It is an arithmetic number, because the mean of its divisors is an integer number (39247777).

Almost surely, 2^78495553 is an apocalyptic number.

It is an amenable number.

78495553 is a deficient number, since it is larger than the sum of its proper divisors (1).

78495553 is an equidigital number, since it uses as much as digits as its factorization.

78495553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756000, while the sum is 46.

The square root of 78495553 is about 8859.7716110518. The cubic root of 78495553 is about 428.1688000582.

The spelling of 78495553 in words is "seventy-eight million, four hundred ninety-five thousand, five hundred fifty-three".