78253663 has 2 divisors, whose sum is σ = 78253664. Its totient is φ = 78253662.

The previous prime is 78253633. The next prime is 78253691. The reversal of 78253663 is 36635287.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78253663 is a prime.

It is a super-2 number, since 2×78253663² = 12247271545835138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78253603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39126831 + 39126832.

It is an arithmetic number, because the mean of its divisors is an integer number (39126832).

Almost surely, 2^78253663 is an apocalyptic number.

78253663 is a deficient number, since it is larger than the sum of its proper divisors (1).

78253663 is an equidigital number, since it uses as much as digits as its factorization.

78253663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 78253663 is about 8846.1100490555. The cubic root of 78253663 is about 427.7285359685.

It can be divided in two parts, 782 and 53663, that added together give a palindrome (54445).

The spelling of 78253663 in words is "seventy-eight million, two hundred fifty-three thousand, six hundred sixty-three".