77547175649 has 2 divisors, whose sum is σ = 77547175650. Its totient is φ = 77547175648.

The previous prime is 77547175609. The next prime is 77547175669. The reversal of 77547175649 is 94657174577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76787181025 + 759994624 = 277105^2 + 27568^2 .

It is a cyclic number.

It is not a de Polignac number, because 77547175649 - 2⁸ = 77547175393 is a prime.

It is a super-2 number, since 2×77547175649² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77547175591 and 77547175600.

It is not a weakly prime, because it can be changed into another prime (77547175609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38773587824 + 38773587825.

It is an arithmetic number, because the mean of its divisors is an integer number (38773587825).

Almost surely, 2^77547175649 is an apocalyptic number.

It is an amenable number.

77547175649 is a deficient number, since it is larger than the sum of its proper divisors (1).

77547175649 is an equidigital number, since it uses as much as digits as its factorization.

77547175649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51861600, while the sum is 62.

The spelling of 77547175649 in words is "seventy-seven billion, five hundred forty-seven million, one hundred seventy-five thousand, six hundred forty-nine".