78461694017 has 16 divisors (see below), whose sum is σ = 94424442240. Its totient is φ = 63690012288.

The previous prime is 78461694011. The next prime is 78461694043. The reversal of 78461694017 is 71049616487.

It is not a de Polignac number, because 78461694017 - 2¹² = 78461689921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78461694017.

It is not an unprimeable number, because it can be changed into a prime (78461694011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263123 + ... + 475559.

It is an arithmetic number, because the mean of its divisors is an integer number (5901527640).

Almost surely, 2^78461694017 is an apocalyptic number.

It is an amenable number.

78461694017 is a deficient number, since it is larger than the sum of its proper divisors (15962748223).

78461694017 is a wasteful number, since it uses less digits than its factorization.

78461694017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215240.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 78461694017 in words is "seventy-eight billion, four hundred sixty-one million, six hundred ninety-four thousand, seventeen".