77656566001 has 8 divisors (see below), whose sum is σ = 88752085184. Its totient is φ = 66561477840.

The previous prime is 77656565971. The next prime is 77656566007. The reversal of 77656566001 is 10066565677.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77656566001 - 2¹³ = 77656557809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77656566007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529906 + ... + 660388.

It is an arithmetic number, because the mean of its divisors is an integer number (11094010648).

Almost surely, 2^77656566001 is an apocalyptic number.

It is an amenable number.

77656566001 is a deficient number, since it is larger than the sum of its proper divisors (11095519183).

77656566001 is a wasteful number, since it uses less digits than its factorization.

77656566001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215511.

The product of its (nonzero) digits is 1587600, while the sum is 49.

The spelling of 77656566001 in words is "seventy-seven billion, six hundred fifty-six million, five hundred sixty-six thousand, one".