78014191561 has 4 divisors (see below), whose sum is σ = 78015217300. Its totient is φ = 78013165824.

The previous prime is 78014191559. The next prime is 78014191583. The reversal of 78014191561 is 16519141087.

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 21596065936 + 56418125625 = 146956^2 + 237525^2 .

It is a cyclic number.

It is not a de Polignac number, because 78014191561 - 2¹ = 78014191559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78014191511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388776 + ... + 554233.

It is an arithmetic number, because the mean of its divisors is an integer number (19503804325).

Almost surely, 2^78014191561 is an apocalyptic number.

It is an amenable number.

78014191561 is a deficient number, since it is larger than the sum of its proper divisors (1025739).

78014191561 is an equidigital number, since it uses as much as digits as its factorization.

78014191561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025738.

The product of its (nonzero) digits is 60480, while the sum is 43.

The spelling of 78014191561 in words is "seventy-eight billion, fourteen million, one hundred ninety-one thousand, five hundred sixty-one".