78513465601 has 4 divisors (see below), whose sum is σ = 83131904772. Its totient is φ = 73895026432.

The previous prime is 78513465599. The next prime is 78513465617. The reversal of 78513465601 is 10656431587.

It is a happy number.

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 21391987600 + 57121478001 = 146260^2 + 239001^2 .

It is a cyclic number.

It is not a de Polignac number, because 78513465601 - 2¹ = 78513465599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78513460601) 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, 2309219560 + ... + 2309219593.

It is an arithmetic number, because the mean of its divisors is an integer number (20782976193).

Almost surely, 2^78513465601 is an apocalyptic number.

It is an amenable number.

78513465601 is a deficient number, since it is larger than the sum of its proper divisors (4618439171).

78513465601 is a wasteful number, since it uses less digits than its factorization.

78513465601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618439170.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 78513465601 in words is "seventy-eight billion, five hundred thirteen million, four hundred sixty-five thousand, six hundred one".