1977381828965 has 16 divisors (see below), whose sum is σ = 2381752485120. Its totient is φ = 1575976616640.

The previous prime is 1977381828937. The next prime is 1977381828967. The reversal of 1977381828965 is 5698281837791.

It is a de Polignac number, because none of the positive numbers 2^k-1977381828965 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1977381828892 and 1977381828901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977381828967) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 32515367 + ... + 32576123.

It is an arithmetic number, because the mean of its divisors is an integer number (148859530320).

Almost surely, 2^{1977381828965} is an apocalyptic number.

It is an amenable number.

1977381828965 is a deficient number, since it is larger than the sum of its proper divisors (404370656155).

1977381828965 is a wasteful number, since it uses less digits than its factorization.

1977381828965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85052.

The product of its digits is 365783040, while the sum is 74.

The spelling of 1977381828965 in words is "one trillion, nine hundred seventy-seven billion, three hundred eighty-one million, eight hundred twenty-eight thousand, nine hundred sixty-five".