77665563 has 6 divisors (see below), whose sum is σ = 112183604. Its totient is φ = 51777036.

The previous prime is 77665561. The next prime is 77665589. The reversal of 77665563 is 36556677.

It is not a de Polignac number, because 77665563 - 2¹ = 77665561 is a prime.

It is a super-2 number, since 2×77665563² = 12063879352213938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77665561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4314745 + ... + 4314762.

Almost surely, 2^77665563 is an apocalyptic number.

77665563 is a deficient number, since it is larger than the sum of its proper divisors (34518041).

77665563 is a wasteful number, since it uses less digits than its factorization.

77665563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8629513 (or 8629510 counting only the distinct ones).

The product of its digits is 793800, while the sum is 45.

The square root of 77665563 is about 8812.8067606183. The cubic root of 77665563 is about 426.6543372766.

It can be divided in two parts, 7 and 7665563, that added together give a triangular number (7665570 = T₃₉₁₅).

The spelling of 77665563 in words is "seventy-seven million, six hundred sixty-five thousand, five hundred sixty-three".