78605757091 has 8 divisors (see below), whose sum is σ = 78762240000. Its totient is φ = 78449359560.

The previous prime is 78605757079. The next prime is 78605757107. The reversal of 78605757091 is 19075750687.

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 78605757091 - 2⁷ = 78605756963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78605752091) 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, 2011860 + ... + 2050558.

It is an arithmetic number, because the mean of its divisors is an integer number (9845280000).

Almost surely, 2^78605757091 is an apocalyptic number.

78605757091 is a deficient number, since it is larger than the sum of its proper divisors (156482909).

78605757091 is a wasteful number, since it uses less digits than its factorization.

78605757091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42689.

The product of its (nonzero) digits is 3704400, while the sum is 55.

The spelling of 78605757091 in words is "seventy-eight billion, six hundred five million, seven hundred fifty-seven thousand, ninety-one".