1977153246721 has 8 divisors (see below), whose sum is σ = 2040975173888. Its totient is φ = 1913333994000.

The previous prime is 1977153246701. The next prime is 1977153246763. The reversal of 1977153246721 is 1276423517791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1977153246721 - 2²⁷ = 1977019028993 is a prime.

It is a super-3 number, since 3×1977153246721³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977153246701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891631 + ... + 2179291.

It is an arithmetic number, because the mean of its divisors is an integer number (255121896736).

Almost surely, 2^{1977153246721} is an apocalyptic number.

It is an amenable number.

1977153246721 is a deficient number, since it is larger than the sum of its proper divisors (63821927167).

1977153246721 is a wasteful number, since it uses less digits than its factorization.

1977153246721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337223.

The product of its digits is 4445280, while the sum is 55.

The spelling of 1977153246721 in words is "one trillion, nine hundred seventy-seven billion, one hundred fifty-three million, two hundred forty-six thousand, seven hundred twenty-one".