77324365561 has 8 divisors (see below), whose sum is σ = 77392335944. Its totient is φ = 77256426240.

The previous prime is 77324365543. The next prime is 77324365571. The reversal of 77324365561 is 16556342377.

It can be written as a sum of positive squares in 4 ways, for example, as 9968025600 + 67356339961 = 99840^2 + 259531^2 .

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 77324365561 - 2²³ = 77315976953 is a prime.

It is a super-2 number, since 2×77324365561² (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 (77324365511) 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, 8761531 + ... + 8770351.

It is an arithmetic number, because the mean of its divisors is an integer number (9674041993).

Almost surely, 2^77324365561 is an apocalyptic number.

It is an amenable number.

77324365561 is a deficient number, since it is larger than the sum of its proper divisors (67970383).

77324365561 is a wasteful number, since it uses less digits than its factorization.

77324365561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15531.

The product of its digits is 3175200, while the sum is 49.

The spelling of 77324365561 in words is "seventy-seven billion, three hundred twenty-four million, three hundred sixty-five thousand, five hundred sixty-one".