78651444365 has 16 divisors (see below), whose sum is σ = 101647722288. Its totient is φ = 58077720576.

The previous prime is 78651444349. The next prime is 78651444371. The reversal of 78651444365 is 56344415687.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 213919876 + 78437524489 = 14626^2 + 280067^2 .

It is a cyclic number.

It is not a de Polignac number, because 78651444365 - 2⁴ = 78651444349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2103917 + ... + 2140973.

It is an arithmetic number, because the mean of its divisors is an integer number (6352982643).

Almost surely, 2^78651444365 is an apocalyptic number.

It is an amenable number.

78651444365 is a deficient number, since it is larger than the sum of its proper divisors (22996277923).

78651444365 is a wasteful number, since it uses less digits than its factorization.

78651444365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69728.

The product of its digits is 9676800, while the sum is 53.

The spelling of 78651444365 in words is "seventy-eight billion, six hundred fifty-one million, four hundred forty-four thousand, three hundred sixty-five".