78066698491 has 8 divisors (see below), whose sum is σ = 78831759600. Its totient is φ = 77302294368.

The previous prime is 78066698477. The next prime is 78066698513. The reversal of 78066698491 is 19489666087.

It is a happy number.

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 78066698491 - 2⁵ = 78066698459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78066698471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76285 + ... + 402433.

It is an arithmetic number, because the mean of its divisors is an integer number (9853969950).

Almost surely, 2^78066698491 is an apocalyptic number.

78066698491 is a deficient number, since it is larger than the sum of its proper divisors (765061109).

78066698491 is a wasteful number, since it uses less digits than its factorization.

78066698491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328493.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The spelling of 78066698491 in words is "seventy-eight billion, sixty-six million, six hundred ninety-eight thousand, four hundred ninety-one".