78338863502 has 4 divisors (see below), whose sum is σ = 117508295256. Its totient is φ = 39169431750.

The previous prime is 78338863483. The next prime is 78338863511. The reversal of 78338863502 is 20536883387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20536883387 = 601 ⋅34171187.

It is a super-2 number, since 2×78338863502² (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 as a sum of consecutive naturals, namely, 19584715874 + ... + 19584715877.

It is an arithmetic number, because the mean of its divisors is an integer number (29377073814).

Almost surely, 2^78338863502 is an apocalyptic number.

78338863502 is a deficient number, since it is larger than the sum of its proper divisors (39169431754).

78338863502 is a wasteful number, since it uses less digits than its factorization.

78338863502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39169431753.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 78338863502 in words is "seventy-eight billion, three hundred thirty-eight million, eight hundred sixty-three thousand, five hundred two".