78536699536 has 15 divisors (see below), whose sum is σ = 152167027273. Its totient is φ = 39267789280.

The previous prime is 78536699533. The next prime is 78536699573. The reversal of 78536699536 is 63599663587.

The square root of 78536699536 is 280244.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20436417936 + 58100281600 = 142956^2 + 241040^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78536699531) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1085946 + ... + 1156006.

Almost surely, 2^78536699536 is an apocalyptic number.

78536699536 is the 280244-th square number.

It is an amenable number.

78536699536 is a deficient number, since it is larger than the sum of its proper divisors (73630327737).

78536699536 is an frugal number, since it uses more digits than its factorization.

78536699536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140130 (or 70063 counting only the distinct ones).

The product of its digits is 220449600, while the sum is 67.

The spelling of 78536699536 in words is "seventy-eight billion, five hundred thirty-six million, six hundred ninety-nine thousand, five hundred thirty-six".