1987953891037 has 2 divisors, whose sum is σ = 1987953891038. Its totient is φ = 1987953891036.

The previous prime is 1987953890971. The next prime is 1987953891041. The reversal of 1987953891037 is 7301983597891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1564473122521 + 423480768516 = 1250789^2 + 650754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987953891037 - 2³⁹ = 1438198077149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987953891047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993976945518 + 993976945519.

It is an arithmetic number, because the mean of its divisors is an integer number (993976945519).

Almost surely, 2^{1987953891037} is an apocalyptic number.

It is an amenable number.

1987953891037 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987953891037 is an equidigital number, since it uses as much as digits as its factorization.

1987953891037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102876480, while the sum is 70.

The spelling of 1987953891037 in words is "one trillion, nine hundred eighty-seven billion, nine hundred fifty-three million, eight hundred ninety-one thousand, thirty-seven".