77066273642 has 4 divisors (see below), whose sum is σ = 115599410466. Its totient is φ = 38533136820.

The previous prime is 77066273639. The next prime is 77066273663. The reversal of 77066273642 is 24637266077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24637266077 = 113683 ⋅216719.

It can be written as a sum of positive squares in only one way, i.e., 49933924681 + 27132348961 = 223459^2 + 164719^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19266568409 + ... + 19266568412.

Almost surely, 2^77066273642 is an apocalyptic number.

77066273642 is a deficient number, since it is larger than the sum of its proper divisors (38533136824).

77066273642 is a wasteful number, since it uses less digits than its factorization.

77066273642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38533136823.

The product of its (nonzero) digits is 3556224, while the sum is 50.

The spelling of 77066273642 in words is "seventy-seven billion, sixty-six million, two hundred seventy-three thousand, six hundred forty-two".