78161209708 has 24 divisors (see below), whose sum is σ = 137403447104. Its totient is φ = 38903328000.

The previous prime is 78161209697. The next prime is 78161209747. The reversal of 78161209708 is 80790216187.

It is a super-2 number, since 2×78161209708² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1271866 + ... + 1331902.

Almost surely, 2^78161209708 is an apocalyptic number.

It is an amenable number.

78161209708 is a deficient number, since it is larger than the sum of its proper divisors (59242237396).

78161209708 is a wasteful number, since it uses less digits than its factorization.

78161209708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61513 (or 61511 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 78161209708 in words is "seventy-eight billion, one hundred sixty-one million, two hundred nine thousand, seven hundred eight".