78550651 has 2 divisors, whose sum is σ = 78550652. Its totient is φ = 78550650.

The previous prime is 78550627. The next prime is 78550657. The reversal of 78550651 is 15605587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78550651 - 2⁹ = 78550139 is a prime.

It is a super-3 number, since 3×78550651³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78550651.

It is not a weakly prime, because it can be changed into another prime (78550657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39275325 + 39275326.

It is an arithmetic number, because the mean of its divisors is an integer number (39275326).

Almost surely, 2^78550651 is an apocalyptic number.

78550651 is a deficient number, since it is larger than the sum of its proper divisors (1).

78550651 is an equidigital number, since it uses as much as digits as its factorization.

78550651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 78550651 is about 8862.8805136931. The cubic root of 78550651 is about 428.2689574388.

The spelling of 78550651 in words is "seventy-eight million, five hundred fifty thousand, six hundred fifty-one".