77774655172036 has 27 divisors (see below), whose sum is σ = 137096189970831. Its totient is φ = 38606345618184.

The previous prime is 77774655172003. The next prime is 77774655172037. The reversal of 77774655172036 is 63027155647777.

It is a happy number.

The square root of 77774655172036 is 8818994.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×77774655172036² (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 (77774655172037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2451664471 + ... + 2451696193.

Almost surely, 2^{77774655172036} is an apocalyptic number.

77774655172036 is the 8818994-th square number.

It is an amenable number.

77774655172036 is a deficient number, since it is larger than the sum of its proper divisors (59321534798795).

77774655172036 is an frugal number, since it uses more digits than its factorization.

77774655172036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63728 (or 31864 counting only the distinct ones).

The product of its (nonzero) digits is 363031200, while the sum is 67.

The spelling of 77774655172036 in words is "seventy-seven trillion, seven hundred seventy-four billion, six hundred fifty-five million, one hundred seventy-two thousand, thirty-six".