77701645061 has 8 divisors (see below), whose sum is σ = 78867786360. Its totient is φ = 76543745472.

The previous prime is 77701645027. The next prime is 77701645097. The reversal of 77701645061 is 16054610777.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31712842561 + 45988802500 = 178081^2 + 214450^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 77701645061 - 2¹⁰ = 77701644037 is a prime.

It is a super-3 number, since 3×77701645061³ (a number of 34 digits) contains 333 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 (77701645261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2041430 + ... + 2079143.

It is an arithmetic number, because the mean of its divisors is an integer number (9858473295).

Almost surely, 2^77701645061 is an apocalyptic number.

It is an amenable number.

77701645061 is a deficient number, since it is larger than the sum of its proper divisors (1166141299).

77701645061 is a wasteful number, since it uses less digits than its factorization.

77701645061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120855.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 77701645061 in words is "seventy-seven billion, seven hundred one million, six hundred forty-five thousand, sixty-one".