77911720009 has 8 divisors (see below), whose sum is σ = 79698028032. Its totient is φ = 76137126000.

The previous prime is 77911719989. The next prime is 77911720039. The reversal of 77911720009 is 90002711977.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77911720009 is a prime.

It is a super-2 number, since 2×77911720009² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77911720039) 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, 2915049 + ... + 2941654.

It is an arithmetic number, because the mean of its divisors is an integer number (9962253504).

Almost surely, 2^77911720009 is an apocalyptic number.

It is an amenable number.

77911720009 is a deficient number, since it is larger than the sum of its proper divisors (1786308023).

77911720009 is a wasteful number, since it uses less digits than its factorization.

77911720009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5857007.

The product of its (nonzero) digits is 55566, while the sum is 43.

The spelling of 77911720009 in words is "seventy-seven billion, nine hundred eleven million, seven hundred twenty thousand, nine".