77117215450 has 24 divisors (see below), whose sum is σ = 156477841920. Its totient is φ = 28042623600.

The previous prime is 77117215421. The next prime is 77117215529. The reversal of 77117215450 is 5451271177.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70106010 + ... + 70107109.

It is an arithmetic number, because the mean of its divisors is an integer number (6519910080).

Almost surely, 2^77117215450 is an apocalyptic number.

77117215450 is an abundant number, since it is smaller than the sum of its proper divisors (79360626470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77117215450 is a wasteful number, since it uses less digits than its factorization.

77117215450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140213142 (or 140213137 counting only the distinct ones).

The product of its (nonzero) digits is 68600, while the sum is 40.

The spelling of 77117215450 in words is "seventy-seven billion, one hundred seventeen million, two hundred fifteen thousand, four hundred fifty".