77220316356500 has 48 divisors (see below), whose sum is σ = 168650843074896. Its totient is φ = 30887820288000.

The previous prime is 77220316356487. The next prime is 77220316356539. The reversal of 77220316356500 is 565361302277.

It can be written as a sum of positive squares in 8 ways, for example, as 6632963306116 + 70587353050384 = 2575454^2 + 8401628^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53565140 + ... + 54987860.

It is an arithmetic number, because the mean of its divisors is an integer number (3513559230727).

Almost surely, 2^{77220316356500} is an apocalyptic number.

It is an amenable number.

77220316356500 is an abundant number, since it is smaller than the sum of its proper divisors (91430526718396).

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

77220316356500 is a wasteful number, since it uses less digits than its factorization.

77220316356500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531293 (or 1531281 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 47.

Adding to 77220316356500 its reverse (565361302277), we get a palindrome (77785677658777).

The spelling of 77220316356500 in words is "seventy-seven trillion, two hundred twenty billion, three hundred sixteen million, three hundred fifty-six thousand, five hundred".