1977760247161 has 16 divisors (see below), whose sum is σ = 2065909482000. Its totient is φ = 1891687108608.

The previous prime is 1977760247143. The next prime is 1977760247167. The reversal of 1977760247161 is 1617420677791.

It can be written as a sum of positive squares in 8 ways, for example, as 5322577936 + 1972437669225 = 72956^2 + 1404435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977760247161 - 2³⁵ = 1943400508793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1977760247096 and 1977760247105.

It is not an unprimeable number, because it can be changed into a prime (1977760247167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1166136 + ... + 2305513.

It is an arithmetic number, because the mean of its divisors is an integer number (129119342625).

Almost surely, 2^{1977760247161} is an apocalyptic number.

It is an amenable number.

1977760247161 is a deficient number, since it is larger than the sum of its proper divisors (88149234839).

1977760247161 is a wasteful number, since it uses less digits than its factorization.

1977760247161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3471948.

The product of its (nonzero) digits is 6223392, while the sum is 58.

The spelling of 1977760247161 in words is "one trillion, nine hundred seventy-seven billion, seven hundred sixty million, two hundred forty-seven thousand, one hundred sixty-one".