78133838516 has 24 divisors (see below), whose sum is σ = 148144328640. Its totient is φ = 35913773952.

The previous prime is 78133838507. The next prime is 78133838543. The reversal of 78133838516 is 61583833187.

It is a happy number.

It is a super-2 number, since 2×78133838516² (a number of 23 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 7 ways as a sum of consecutive naturals, for example, 13357856 + ... + 13363703.

It is an arithmetic number, because the mean of its divisors is an integer number (6172680360).

Almost surely, 2^78133838516 is an apocalyptic number.

It is an amenable number.

78133838516 is a deficient number, since it is larger than the sum of its proper divisors (70010490124).

78133838516 is a wasteful number, since it uses less digits than its factorization.

78133838516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26721623 (or 26721621 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The spelling of 78133838516 in words is "seventy-eight billion, one hundred thirty-three million, eight hundred thirty-eight thousand, five hundred sixteen".