77530666 has 4 divisors (see below), whose sum is σ = 116296002. Its totient is φ = 38765332.

The previous prime is 77530619. The next prime is 77530669. The reversal of 77530666 is 66603577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66603577 = 2969 ⋅22433.

It can be written as a sum of positive squares in only one way, i.e., 42968025 + 34562641 = 6555^2 + 5879^2 .

It is a super-2 number, since 2×77530666² = 12022008340807112, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (77530669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19382665 + ... + 19382668.

Almost surely, 2^77530666 is an apocalyptic number.

77530666 is a deficient number, since it is larger than the sum of its proper divisors (38765336).

77530666 is a wasteful number, since it uses less digits than its factorization.

77530666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38765335.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 77530666 is about 8805.1499703299. The cubic root of 77530666 is about 426.4071760635.

The spelling of 77530666 in words is "seventy-seven million, five hundred thirty thousand, six hundred sixty-six".