78515010073 has 4 divisors (see below), whose sum is σ = 79508871040. Its totient is φ = 77521149108.

The previous prime is 78515010071. The next prime is 78515010113. The reversal of 78515010073 is 37001051587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37001051587 = 60689 ⋅609683.

It is a cyclic number.

It is not a de Polignac number, because 78515010073 - 2¹ = 78515010071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78515010071) 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, 496930365 + ... + 496930522.

It is an arithmetic number, because the mean of its divisors is an integer number (19877217760).

Almost surely, 2^78515010073 is an apocalyptic number.

It is an amenable number.

78515010073 is a deficient number, since it is larger than the sum of its proper divisors (993860967).

78515010073 is an equidigital number, since it uses as much as digits as its factorization.

78515010073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993860966.

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 78515010073 in words is "seventy-eight billion, five hundred fifteen million, ten thousand, seventy-three".