78624016577 has 8 divisors (see below), whose sum is σ = 81489810600. Its totient is φ = 75797213184.

The previous prime is 78624016561. The next prime is 78624016607. The reversal of 78624016577 is 77561042687.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30365153536 + 48258863041 = 174256^2 + 219679^2 .

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 78624016577 - 2⁴ = 78624016561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78624516577) 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, 9743552 + ... + 9751617.

It is an arithmetic number, because the mean of its divisors is an integer number (10186226325).

Almost surely, 2^78624016577 is an apocalyptic number.

It is an amenable number.

78624016577 is a deficient number, since it is larger than the sum of its proper divisors (2865794023).

78624016577 is a wasteful number, since it uses less digits than its factorization.

78624016577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19495315.

The product of its (nonzero) digits is 3951360, while the sum is 53.

The spelling of 78624016577 in words is "seventy-eight billion, six hundred twenty-four million, sixteen thousand, five hundred seventy-seven".