77956066 has 4 divisors (see below), whose sum is σ = 116934102. Its totient is φ = 38978032.

The previous prime is 77956063. The next prime is 77956097. The reversal of 77956066 is 66065977.

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., 56565441 + 21390625 = 7521^2 + 4625^2 .

It is not an unprimeable number, because it can be changed into a prime (77956063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19489015 + ... + 19489018.

Almost surely, 2^77956066 is an apocalyptic number.

77956066 is a deficient number, since it is larger than the sum of its proper divisors (38978036).

77956066 is a wasteful number, since it uses less digits than its factorization.

77956066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38978035.

The product of its (nonzero) digits is 476280, while the sum is 46.

The square root of 77956066 is about 8829.2732430252. The cubic root of 77956066 is about 427.1856330239.

It can be divided in two parts, 7795 and 6066, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 77956066 in words is "seventy-seven million, nine hundred fifty-six thousand, sixty-six".