77388810062281 has 9 divisors (see below), whose sum is σ = 77469642842151. Its totient is φ = 77308061563992.

The previous prime is 77388810062269. The next prime is 77388810062287. The reversal of 77388810062281 is 18226001888377.

It is a happy number.

The square root of 77388810062281 is 8797091.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 33882702183225 + 43506107879056 = 5820885^2 + 6595916^2 .

It is not a de Polignac number, because 77388810062281 - 2¹³ = 77388810054089 is a prime.

It is a super-2 number, since 2×77388810062281² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77388810062287) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9562433871 + ... + 9562441963.

Almost surely, 2^{77388810062281} is an apocalyptic number.

77388810062281 is the 8797091-st square number.

77388810062281 is the 4398546-th centered octagonal number.

It is an amenable number.

77388810062281 is a deficient number, since it is larger than the sum of its proper divisors (80832779870).

77388810062281 is an frugal number, since it uses more digits than its factorization.

77388810062281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18360 (or 9180 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 61.

The spelling of 77388810062281 in words is "seventy-seven trillion, three hundred eighty-eight billion, eight hundred ten million, sixty-two thousand, two hundred eighty-one".