1977489747497 has 16 divisors (see below), whose sum is σ = 2273874604800. Its totient is φ = 1700796482640.

The previous prime is 1977489747469. The next prime is 1977489747521. The reversal of 1977489747497 is 7947479847791.

It is a cyclic number.

It is not a de Polignac number, because 1977489747497 - 2³⁰ = 1976416005673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977489741497) 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, 6247223 + ... + 6556124.

It is an arithmetic number, because the mean of its divisors is an integer number (142117162800).

Almost surely, 2^{1977489747497} is an apocalyptic number.

It is an amenable number.

1977489747497 is a deficient number, since it is larger than the sum of its proper divisors (296384857303).

1977489747497 is a wasteful number, since it uses less digits than its factorization.

1977489747497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804116.

The product of its digits is 6273179136, while the sum is 83.

The spelling of 1977489747497 in words is "one trillion, nine hundred seventy-seven billion, four hundred eighty-nine million, seven hundred forty-seven thousand, four hundred ninety-seven".