78501519361 has 4 divisors (see below), whose sum is σ = 83119255812. Its totient is φ = 73883782912.

The previous prime is 78501519337. The next prime is 78501519373. The reversal of 78501519361 is 16391510587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67889429136 + 10612090225 = 260556^2 + 103015^2 .

It is a cyclic number.

It is not a de Polignac number, because 78501519361 - 2¹⁷ = 78501388289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78501519331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2308868200 + ... + 2308868233.

It is an arithmetic number, because the mean of its divisors is an integer number (20779813953).

Almost surely, 2^78501519361 is an apocalyptic number.

It is an amenable number.

78501519361 is a deficient number, since it is larger than the sum of its proper divisors (4617736451).

78501519361 is a wasteful number, since it uses less digits than its factorization.

78501519361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4617736450.

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 78501519361 in words is "seventy-eight billion, five hundred one million, five hundred nineteen thousand, three hundred sixty-one".