777227690642 has 54 divisors (see below), whose sum is σ = 1280712304053. Its totient is φ = 353596215024.

The previous prime is 777227690573. The next prime is 777227690653. The reversal of 777227690642 is 246096722777.

It can be written as a sum of positive squares in 2 ways, for example, as 664552670401 + 112675020241 = 815201^2 + 335671^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=623389.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1280440703 + ... + 1280441309.

Almost surely, 2^777227690642 is an apocalyptic number.

777227690642 is a deficient number, since it is larger than the sum of its proper divisors (503484613411).

777227690642 is an frugal number, since it uses more digits than its factorization.

777227690642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 24893568, while the sum is 59.

The spelling of 777227690642 in words is "seven hundred seventy-seven billion, two hundred twenty-seven million, six hundred ninety thousand, six hundred forty-two".