77132566370521 has 8 divisors (see below), whose sum is σ = 79817489152200. Its totient is φ = 74449322196480.

The previous prime is 77132566370513. The next prime is 77132566370537. The reversal of 77132566370521 is 12507366523177.

It can be written as a sum of positive squares in 4 ways, for example, as 11372144252121 + 65760422118400 = 3372261^2 + 8109280^2 .

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 77132566370521 - 2³ = 77132566370513 is a prime.

It is a super-2 number, since 2×77132566370521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77132566370501) 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, 419558410 + ... + 419742211.

It is an arithmetic number, because the mean of its divisors is an integer number (9977186144025).

Almost surely, 2^{77132566370521} is an apocalyptic number.

It is an amenable number.

77132566370521 is a deficient number, since it is larger than the sum of its proper divisors (2684922781679).

77132566370521 is a wasteful number, since it uses less digits than its factorization.

77132566370521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839303819.

The product of its (nonzero) digits is 11113200, while the sum is 55.

The spelling of 77132566370521 in words is "seventy-seven trillion, one hundred thirty-two billion, five hundred sixty-six million, three hundred seventy thousand, five hundred twenty-one".