1988733513761 has 4 divisors (see below), whose sum is σ = 1993595943300. Its totient is φ = 1983871084224.

The previous prime is 1988733513749. The next prime is 1988733513773. The reversal of 1988733513761 is 1673153378891.

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

It is an interprime number because it is at equal distance from previous prime (1988733513749) and next prime (1988733513773).

It can be written as a sum of positive squares in 2 ways, for example, as 1267200490000 + 721533023761 = 1125700^2 + 849431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988733513761 - 2²⁶ = 1988666404897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1988733513694 and 1988733513703.

It is not an unprimeable number, because it can be changed into a prime (1988733515761) 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, 2431214156 + ... + 2431214973.

It is an arithmetic number, because the mean of its divisors is an integer number (498398985825).

Almost surely, 2^{1988733513761} is an apocalyptic number.

It is an amenable number.

1988733513761 is a deficient number, since it is larger than the sum of its proper divisors (4862429539).

1988733513761 is an equidigital number, since it uses as much as digits as its factorization.

1988733513761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862429538.

The product of its digits is 22861440, while the sum is 62.

The spelling of 1988733513761 in words is "one trillion, nine hundred eighty-eight billion, seven hundred thirty-three million, five hundred thirteen thousand, seven hundred sixty-one".