78150998015 has 4 divisors (see below), whose sum is σ = 93781197624. Its totient is φ = 62520798408.

The previous prime is 78150997973. The next prime is 78150998077. The reversal of 78150998015 is 51089905187.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51089905187 = 15787 ⋅3236201.

It is a cyclic number.

It is not a de Polignac number, because 78150998015 - 2¹² = 78150993919 is a prime.

It is a super-2 number, since 2×78150998015² (a number of 23 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 7815099797 + ... + 7815099806.

It is an arithmetic number, because the mean of its divisors is an integer number (23445299406).

Almost surely, 2^78150998015 is an apocalyptic number.

78150998015 is a deficient number, since it is larger than the sum of its proper divisors (15630199609).

78150998015 is a wasteful number, since it uses less digits than its factorization.

78150998015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15630199608.

The product of its (nonzero) digits is 907200, while the sum is 53.

The spelling of 78150998015 in words is "seventy-eight billion, one hundred fifty million, nine hundred ninety-eight thousand, fifteen".