78934493561 has 8 divisors (see below), whose sum is σ = 98411836224. Its totient is φ = 61507397520.

The previous prime is 78934493549. The next prime is 78934493587. The reversal of 78934493561 is 16539443987.

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 78934493561 - 2⁶ = 78934493497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78934493561.

It is not an unprimeable number, because it can be changed into a prime (78934493501) 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, 512561570 + ... + 512561723.

It is an arithmetic number, because the mean of its divisors is an integer number (12301479528).

Almost surely, 2^78934493561 is an apocalyptic number.

It is an amenable number.

78934493561 is a deficient number, since it is larger than the sum of its proper divisors (19477342663).

78934493561 is a wasteful number, since it uses less digits than its factorization.

78934493561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025123311.

The product of its digits is 19595520, while the sum is 59.

The spelling of 78934493561 in words is "seventy-eight billion, nine hundred thirty-four million, four hundred ninety-three thousand, five hundred sixty-one".