78297561466 has 4 divisors (see below), whose sum is σ = 117446342202. Its totient is φ = 39148780732.

The previous prime is 78297561449. The next prime is 78297561497. The reversal of 78297561466 is 66416579287.

It is a happy number.

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., 78095097025 + 202464441 = 279455^2 + 14229^2 .

It is a super-2 number, since 2×78297561466² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19574390365 + ... + 19574390368.

Almost surely, 2^78297561466 is an apocalyptic number.

78297561466 is a deficient number, since it is larger than the sum of its proper divisors (39148780736).

78297561466 is a wasteful number, since it uses less digits than its factorization.

78297561466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39148780735.

The product of its digits is 30481920, while the sum is 61.

The spelling of 78297561466 in words is "seventy-eight billion, two hundred ninety-seven million, five hundred sixty-one thousand, four hundred sixty-six".