77958180091 has 8 divisors (see below), whose sum is σ = 85061454768. Its totient is φ = 70857600000.

The previous prime is 77958180089. The next prime is 77958180173. The reversal of 77958180091 is 19008185977.

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

It is not a de Polignac number, because 77958180091 - 2¹ = 77958180089 is a prime.

It is a super-4 number, since 4×77958180091⁴ (a number of 45 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77958183091) 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, 612910 + ... + 729091.

It is an arithmetic number, because the mean of its divisors is an integer number (10632681846).

Almost surely, 2^77958180091 is an apocalyptic number.

77958180091 is a deficient number, since it is larger than the sum of its proper divisors (7103274677).

77958180091 is a wasteful number, since it uses less digits than its factorization.

77958180091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347293.

The product of its (nonzero) digits is 1270080, while the sum is 55.

The spelling of 77958180091 in words is "seventy-seven billion, nine hundred fifty-eight million, one hundred eighty thousand, ninety-one".