78266663 has 4 divisors (see below), whose sum is σ = 80175648. Its totient is φ = 76357680.

The previous prime is 78266651. The next prime is 78266693. The reversal of 78266663 is 36666287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36666287 = 7 ⋅5238041.

It is a cyclic number.

It is not a de Polignac number, because 78266663 - 2⁴ = 78266647 is a prime.

It is a super-2 number, since 2×78266663² = 12251341074311138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78266693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954431 + ... + 954512.

It is an arithmetic number, because the mean of its divisors is an integer number (20043912).

Almost surely, 2^78266663 is an apocalyptic number.

78266663 is a deficient number, since it is larger than the sum of its proper divisors (1908985).

78266663 is a wasteful number, since it uses less digits than its factorization.

78266663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908984.

The product of its digits is 435456, while the sum is 44.

The square root of 78266663 is about 8846.8448047877. The cubic root of 78266663 is about 427.7522203255.

The spelling of 78266663 in words is "seventy-eight million, two hundred sixty-six thousand, six hundred sixty-three".