78617530645 has 8 divisors (see below), whose sum is σ = 94349076480. Its totient is φ = 62888664720.

The previous prime is 78617530637. The next prime is 78617530669. The reversal of 78617530645 is 54603571687.

It is a happy number.

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

It is not a de Polignac number, because 78617530645 - 2³ = 78617530637 is a prime.

It is a super-2 number, since 2×78617530645² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78617530592 and 78617530601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604861 + ... + 723250.

It is an arithmetic number, because the mean of its divisors is an integer number (11793634560).

Almost surely, 2^78617530645 is an apocalyptic number.

It is an amenable number.

78617530645 is a deficient number, since it is larger than the sum of its proper divisors (15731545835).

78617530645 is a wasteful number, since it uses less digits than its factorization.

78617530645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339955.

The product of its (nonzero) digits is 4233600, while the sum is 52.

The spelling of 78617530645 in words is "seventy-eight billion, six hundred seventeen million, five hundred thirty thousand, six hundred forty-five".