77550405601 has 2 divisors, whose sum is σ = 77550405602. Its totient is φ = 77550405600.

The previous prime is 77550405523. The next prime is 77550405623. The reversal of 77550405601 is 10650405577.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65669187600 + 11881218001 = 256260^2 + 109001^2 .

It is a cyclic number.

It is not a de Polignac number, because 77550405601 - 2¹³ = 77550397409 is a prime.

It is a super-2 number, since 2×77550405601² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77550445601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38775202800 + 38775202801.

It is an arithmetic number, because the mean of its divisors is an integer number (38775202801).

Almost surely, 2^77550405601 is an apocalyptic number.

It is an amenable number.

77550405601 is a deficient number, since it is larger than the sum of its proper divisors (1).

77550405601 is an equidigital number, since it uses as much as digits as its factorization.

77550405601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147000, while the sum is 40.

The spelling of 77550405601 in words is "seventy-seven billion, five hundred fifty million, four hundred five thousand, six hundred one".