77661466 has 4 divisors (see below), whose sum is σ = 116492202. Its totient is φ = 38830732.

The previous prime is 77661461. The next prime is 77661469. The reversal of 77661466 is 66416677.

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., 76930441 + 731025 = 8771^2 + 855^2 .

It is not an unprimeable number, because it can be changed into a prime (77661461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19415365 + ... + 19415368.

Almost surely, 2^77661466 is an apocalyptic number.

77661466 is a deficient number, since it is larger than the sum of its proper divisors (38830736).

77661466 is a wasteful number, since it uses less digits than its factorization.

77661466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38830735.

The product of its digits is 254016, while the sum is 43.

The square root of 77661466 is about 8812.5743117434. The cubic root of 77661466 is about 426.6468348801.

The spelling of 77661466 in words is "seventy-seven million, six hundred sixty-one thousand, four hundred sixty-six".