78465744466066 has 4 divisors (see below), whose sum is σ = 117698616699102. Its totient is φ = 39232872233032.

The previous prime is 78465744466063. The next prime is 78465744466099. The reversal of 78465744466066 is 66066444756487.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41847766930225 + 36617977535841 = 6468985^2 + 6051279^2 .

It is a super-2 number, since 2×78465744466066² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78465744466066.

It is not an unprimeable number, because it can be changed into a prime (78465744466063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19616436116515 + ... + 19616436116518.

Almost surely, 2^{78465744466066} is an apocalyptic number.

78465744466066 is a deficient number, since it is larger than the sum of its proper divisors (39232872233036).

78465744466066 is a wasteful number, since it uses less digits than its factorization.

78465744466066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39232872233035.

The product of its (nonzero) digits is 3901685760, while the sum is 73.

The spelling of 78465744466066 in words is "seventy-eight trillion, four hundred sixty-five billion, seven hundred forty-four million, four hundred sixty-six thousand, sixty-six".