78403215672066 has 16 divisors (see below), whose sum is σ = 158954464651104. Its totient is φ = 25776399672864.

The previous prime is 78403215672053. The next prime is 78403215672073. The reversal of 78403215672066 is 66027651230487.

It is a happy number.

It is a super-2 number, since 2×78403215672066² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78403215671997 and 78403215672015.

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, 89501387316 + ... + 89501388191.

It is an arithmetic number, because the mean of its divisors is an integer number (9934654040694).

Almost surely, 2^{78403215672066} is an apocalyptic number.

78403215672066 is an abundant number, since it is smaller than the sum of its proper divisors (80551248979038).

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

78403215672066 is a wasteful number, since it uses less digits than its factorization.

78403215672066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179002775585.

The product of its (nonzero) digits is 20321280, while the sum is 57.

The spelling of 78403215672066 in words is "seventy-eight trillion, four hundred three billion, two hundred fifteen million, six hundred seventy-two thousand, sixty-six".