77373510091 has 4 divisors (see below), whose sum is σ = 77382030184. Its totient is φ = 77364990000.

The previous prime is 77373510061. The next prime is 77373510107. The reversal of 77373510091 is 19001537377.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77373510091 - 2⁹ = 77373509579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77373510061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4246410 + ... + 4264591.

It is an arithmetic number, because the mean of its divisors is an integer number (19345507546).

Almost surely, 2^77373510091 is an apocalyptic number.

77373510091 is a deficient number, since it is larger than the sum of its proper divisors (8520093).

77373510091 is an equidigital number, since it uses as much as digits as its factorization.

77373510091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8520092.

The product of its (nonzero) digits is 138915, while the sum is 43.

The spelling of 77373510091 in words is "seventy-seven billion, three hundred seventy-three million, five hundred ten thousand, ninety-one".