77845035077 has 4 divisors (see below), whose sum is σ = 77845651980. Its totient is φ = 77844418176.

The previous prime is 77845035067. The next prime is 77845035179. The reversal of 77845035077 is 77053054877.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 76283125636 + 1561909441 = 276194^2 + 39521^2 .

It is a cyclic number.

It is not a de Polignac number, because 77845035077 - 2⁴ = 77845035061 is a prime.

It is a super-2 number, since 2×77845035077² (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 (77845035067) 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, 43052 + ... + 396917.

It is an arithmetic number, because the mean of its divisors is an integer number (19461412995).

Almost surely, 2^77845035077 is an apocalyptic number.

It is an amenable number.

77845035077 is a deficient number, since it is larger than the sum of its proper divisors (616903).

77845035077 is a wasteful number, since it uses less digits than its factorization.

77845035077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616902.

The product of its (nonzero) digits is 5762400, while the sum is 53.

The spelling of 77845035077 in words is "seventy-seven billion, eight hundred forty-five million, thirty-five thousand, seventy-seven".