78280775253 has 6 divisors (see below), whose sum is σ = 113072230934. Its totient is φ = 52187183496.

The previous prime is 78280775203. The next prime is 78280775299. The reversal of 78280775253 is 35257708287.

It can be written as a sum of positive squares in only one way, i.e., 41248391409 + 37032383844 = 203097^2 + 192438^2 .

It is not a de Polignac number, because 78280775253 - 2⁶ = 78280775189 is a prime.

It is a super-2 number, since 2×78280775253² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78280775253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78280775203) 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, 4348931950 + ... + 4348931967.

Almost surely, 2^78280775253 is an apocalyptic number.

It is an amenable number.

78280775253 is a deficient number, since it is larger than the sum of its proper divisors (34791455681).

78280775253 is a wasteful number, since it uses less digits than its factorization.

78280775253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8697863923 (or 8697863920 counting only the distinct ones).

The product of its (nonzero) digits is 6585600, while the sum is 54.

The spelling of 78280775253 in words is "seventy-eight billion, two hundred eighty million, seven hundred seventy-five thousand, two hundred fifty-three".