1977072453791 has 4 divisors (see below), whose sum is σ = 2030506844472. Its totient is φ = 1923638063112.

The previous prime is 1977072453749. The next prime is 1977072453793. The reversal of 1977072453791 is 1973542707791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1977072453791 - 2³⁴ = 1959892584607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977072453793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26717195285 + ... + 26717195358.

It is an arithmetic number, because the mean of its divisors is an integer number (507626711118).

Almost surely, 2^{1977072453791} is an apocalyptic number.

1977072453791 is a deficient number, since it is larger than the sum of its proper divisors (53434390681).

1977072453791 is an equidigital number, since it uses as much as digits as its factorization.

1977072453791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53434390680.

The product of its (nonzero) digits is 23337720, while the sum is 62.

The spelling of 1977072453791 in words is "one trillion, nine hundred seventy-seven billion, seventy-two million, four hundred fifty-three thousand, seven hundred ninety-one".