78503557506 has 32 divisors (see below), whose sum is σ = 171291122496. Its totient is φ = 23787480000.

The previous prime is 78503557501. The next prime is 78503557507. The reversal of 78503557506 is 60575530587.

It is not an unprimeable number, because it can be changed into a prime (78503557501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1541856 + ... + 1591956.

It is an arithmetic number, because the mean of its divisors is an integer number (5352847578).

Almost surely, 2^78503557506 is an apocalyptic number.

78503557506 is an abundant number, since it is smaller than the sum of its proper divisors (92787564990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78503557506 is a wasteful number, since it uses less digits than its factorization.

78503557506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73858.

The product of its (nonzero) digits is 4410000, while the sum is 51.

The spelling of 78503557506 in words is "seventy-eight billion, five hundred three million, five hundred fifty-seven thousand, five hundred six".