77852577561 has 8 divisors (see below), whose sum is σ = 113240112864. Its totient is φ = 47183380320.

The previous prime is 77852577559. The next prime is 77852577563. The reversal of 77852577561 is 16577525877.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77852577559) and next prime (77852577563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77852577561 - 2¹ = 77852577559 is a prime.

It is a super-2 number, since 2×77852577561² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77852577495 and 77852577504.

It is not an unprimeable number, because it can be changed into a prime (77852577563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1179584476 + ... + 1179584541.

It is an arithmetic number, because the mean of its divisors is an integer number (14155014108).

Almost surely, 2^77852577561 is an apocalyptic number.

It is an amenable number.

77852577561 is a deficient number, since it is larger than the sum of its proper divisors (35387535303).

77852577561 is a wasteful number, since it uses less digits than its factorization.

77852577561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359169031.

The product of its digits is 28812000, while the sum is 60.

It can be divided in two parts, 778525 and 77561, that added together give a triangular number (856086 = T₁₃₀₈).

The spelling of 77852577561 in words is "seventy-seven billion, eight hundred fifty-two million, five hundred seventy-seven thousand, five hundred sixty-one".