77800077533 has 4 divisors (see below), whose sum is σ = 82376552700. Its totient is φ = 73223602368.

The previous prime is 77800077517. The next prime is 77800077557. The reversal of 77800077533 is 33577000877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33577000877 = 7 ⋅4796714411.

It can be written as a sum of positive squares in 2 ways, for example, as 61077191044 + 16722886489 = 247138^2 + 129317^2 .

It is a cyclic number.

It is not a de Polignac number, because 77800077533 - 2⁴ = 77800077517 is a prime.

It is a super-2 number, since 2×77800077533² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77800067533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2288237558 + ... + 2288237591.

It is an arithmetic number, because the mean of its divisors is an integer number (20594138175).

Almost surely, 2^77800077533 is an apocalyptic number.

It is an amenable number.

77800077533 is a deficient number, since it is larger than the sum of its proper divisors (4576475167).

77800077533 is a wasteful number, since it uses less digits than its factorization.

77800077533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4576475166.

The product of its (nonzero) digits is 864360, while the sum is 47.

The spelling of 77800077533 in words is "seventy-seven billion, eight hundred million, seventy-seven thousand, five hundred thirty-three".