78353780872785 has 32 divisors (see below), whose sum is σ = 136764320652288. Its totient is φ = 37989334806720.

The previous prime is 78353780872721. The next prime is 78353780872799. The reversal of 78353780872785 is 58727808735387.

It is not a de Polignac number, because 78353780872785 - 2⁶ = 78353780872721 is a prime.

It is a super-2 number, since 2×78353780872785² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78353780872785.

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, 14686614 + ... + 19297776.

It is an arithmetic number, because the mean of its divisors is an integer number (4273885020384).

Almost surely, 2^{78353780872785} is an apocalyptic number.

It is an amenable number.

78353780872785 is a deficient number, since it is larger than the sum of its proper divisors (58410539779503).

78353780872785 is a wasteful number, since it uses less digits than its factorization.

78353780872785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4714165.

The product of its (nonzero) digits is 4425523200, while the sum is 78.

The spelling of 78353780872785 in words is "seventy-eight trillion, three hundred fifty-three billion, seven hundred eighty million, eight hundred seventy-two thousand, seven hundred eighty-five".