78215753144685 has 32 divisors (see below), whose sum is σ = 135569225352960. Its totient is φ = 38506216916544.

The previous prime is 78215753144677. The next prime is 78215753144717. The reversal of 78215753144685 is 58644135751287.

It is not a de Polignac number, because 78215753144685 - 2³ = 78215753144677 is a prime.

It is a super-2 number, since 2×78215753144685² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1186672449 + ... + 1186738358.

It is an arithmetic number, because the mean of its divisors is an integer number (4236538292280).

Almost surely, 2^{78215753144685} is an apocalyptic number.

It is an amenable number.

78215753144685 is a deficient number, since it is larger than the sum of its proper divisors (57353472208275).

78215753144685 is a wasteful number, since it uses less digits than its factorization.

78215753144685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373410854 (or 2373410828 counting only the distinct ones).

The product of its digits is 225792000, while the sum is 66.

The spelling of 78215753144685 in words is "seventy-eight trillion, two hundred fifteen billion, seven hundred fifty-three million, one hundred forty-four thousand, six hundred eighty-five".