78515681455 has 8 divisors (see below), whose sum is σ = 95190146352. Its totient is φ = 62164992768.

The previous prime is 78515681443. The next prime is 78515681471. The reversal of 78515681455 is 55418651587.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78515681455 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78515681396 and 78515681405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80943517 + ... + 80944486.

It is an arithmetic number, because the mean of its divisors is an integer number (11898768294).

Almost surely, 2^78515681455 is an apocalyptic number.

78515681455 is a deficient number, since it is larger than the sum of its proper divisors (16674464897).

78515681455 is a wasteful number, since it uses less digits than its factorization.

78515681455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161888105.

The product of its digits is 6720000, while the sum is 55.

The spelling of 78515681455 in words is "seventy-eight billion, five hundred fifteen million, six hundred eighty-one thousand, four hundred fifty-five".