77136671377 has 4 divisors (see below), whose sum is σ = 77137359156. Its totient is φ = 77135983600.

The previous prime is 77136671347. The next prime is 77136671393. The reversal of 77136671377 is 77317663177.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77317663177 = 31 ⋅2494118167.

It can be written as a sum of positive squares in 2 ways, for example, as 73658502801 + 3478168576 = 271401^2 + 58976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77136671377 is a prime.

It is a super-2 number, since 2×77136671377² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77136671347) 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, 132238 + ... + 414439.

It is an arithmetic number, because the mean of its divisors is an integer number (19284339789).

Almost surely, 2^77136671377 is an apocalyptic number.

It is an amenable number.

77136671377 is a deficient number, since it is larger than the sum of its proper divisors (687779).

77136671377 is a wasteful number, since it uses less digits than its factorization.

77136671377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687778.

The product of its digits is 5445468, while the sum is 55.

The spelling of 77136671377 in words is "seventy-seven billion, one hundred thirty-six million, six hundred seventy-one thousand, three hundred seventy-seven".