1987953891057 has 16 divisors (see below), whose sum is σ = 2945348140480. Its totient is φ = 1325198524896.

The previous prime is 1987953891047. The next prime is 1987953891083. The reversal of 1987953891057 is 7501983597891.

1987953891057 is a `hidden beast` number, since 1 + 9 + 8 + 79 + 538 + 9 + 10 + 5 + 7 = 666.

It is not a de Polignac number, because 1987953891057 - 2⁴ = 1987953891041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987953891037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2539828 + ... + 3229029.

It is an arithmetic number, because the mean of its divisors is an integer number (184084258780).

Almost surely, 2^{1987953891057} is an apocalyptic number.

It is an amenable number.

1987953891057 is a deficient number, since it is larger than the sum of its proper divisors (957394249423).

1987953891057 is a wasteful number, since it uses less digits than its factorization.

1987953891057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5781629 (or 5781623 counting only the distinct ones).

The product of its (nonzero) digits is 171460800, while the sum is 72.

The spelling of 1987953891057 in words is "one trillion, nine hundred eighty-seven billion, nine hundred fifty-three million, eight hundred ninety-one thousand, fifty-seven".