78666091243 has 8 divisors (see below), whose sum is σ = 79031651328. Its totient is φ = 78300645864.

The previous prime is 78666091211. The next prime is 78666091249. The reversal of 78666091243 is 34219066687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78666091243 - 2⁵ = 78666091211 is a prime.

It is a super-2 number, since 2×78666091243² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78666091249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1545546 + ... + 1595632.

It is an arithmetic number, because the mean of its divisors is an integer number (9878956416).

Almost surely, 2^78666091243 is an apocalyptic number.

78666091243 is a deficient number, since it is larger than the sum of its proper divisors (365560085).

78666091243 is a wasteful number, since it uses less digits than its factorization.

78666091243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57353.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 78666091243 in words is "seventy-eight billion, six hundred sixty-six million, ninety-one thousand, two hundred forty-three".