78566903 has 2 divisors, whose sum is σ = 78566904. Its totient is φ = 78566902.

The previous prime is 78566879. The next prime is 78566921. The reversal of 78566903 is 30966587.

It is a strong prime.

It is an emirp because it is prime and its reverse (30966587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78566903 - 2⁸ = 78566647 is a prime.

It is a super-2 number, since 2×78566903² = 12345516494022818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78566003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39283451 + 39283452.

It is an arithmetic number, because the mean of its divisors is an integer number (39283452).

Almost surely, 2^78566903 is an apocalyptic number.

78566903 is a deficient number, since it is larger than the sum of its proper divisors (1).

78566903 is an equidigital number, since it uses as much as digits as its factorization.

78566903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 78566903 is about 8863.7973239464. The cubic root of 78566903 is about 428.2984914488.

The spelling of 78566903 in words is "seventy-eight million, five hundred sixty-six thousand, nine hundred three".