77903730563481 has 45 divisors (see below), whose sum is σ = 119149260702021. Its totient is φ = 50725786369608.

The previous prime is 77903730563443. The next prime is 77903730563509. The reversal of 77903730563481 is 18436503730977.

It is a happy number.

The square root of 77903730563481 is 8826309.

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

77903730563481 is a `hidden beast` number, since 7 + 7 + 9 + 0 + 37 + 30 + 563 + 4 + 8 + 1 = 666.

It is not a de Polignac number, because 77903730563481 - 2²¹ = 77903728466329 is a prime.

It is a super-2 number, since 2×77903730563481² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77903730543481) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 3415770180 + ... + 3415792986.

Almost surely, 2^{77903730563481} is an apocalyptic number.

77903730563481 is the 8826309-th square number.

77903730563481 is the 4413155-th centered octagonal number.

It is an amenable number.

77903730563481 is a deficient number, since it is larger than the sum of its proper divisors (41245530138540).

77903730563481 is an frugal number, since it uses more digits than its factorization.

77903730563481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45712 (or 22853 counting only the distinct ones).

The product of its (nonzero) digits is 80015040, while the sum is 63.

The spelling of 77903730563481 in words is "seventy-seven trillion, nine hundred three billion, seven hundred thirty million, five hundred sixty-three thousand, four hundred eighty-one".