78946272553 has 2 divisors, whose sum is σ = 78946272554. Its totient is φ = 78946272552.

The previous prime is 78946272491. The next prime is 78946272607. The reversal of 78946272553 is 35527264987.

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., 48255787584 + 30690484969 = 219672^2 + 175187^2 .

It is a cyclic number.

It is not a de Polignac number, because 78946272553 - 2¹⁷ = 78946141481 is a prime.

It is a super-2 number, since 2×78946272553² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78946272253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39473136276 + 39473136277.

It is an arithmetic number, because the mean of its divisors is an integer number (39473136277).

Almost surely, 2^78946272553 is an apocalyptic number.

It is an amenable number.

78946272553 is a deficient number, since it is larger than the sum of its proper divisors (1).

78946272553 is an equidigital number, since it uses as much as digits as its factorization.

78946272553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 58.

The spelling of 78946272553 in words is "seventy-eight billion, nine hundred forty-six million, two hundred seventy-two thousand, five hundred fifty-three".