1988959555487 has 8 divisors (see below), whose sum is σ = 2111455766016. Its totient is φ = 1867074299392.

The previous prime is 1988959555483. The next prime is 1988959555489. The reversal of 1988959555487 is 7845559598891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1988959555487 - 2² = 1988959555483 is a prime.

It is a super-2 number, since 2×1988959555487² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988959555481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152731898 + ... + 152744919.

It is an arithmetic number, because the mean of its divisors is an integer number (263931970752).

Almost surely, 2^{1988959555487} is an apocalyptic number.

1988959555487 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1988959555487 is a deficient number, since it is larger than the sum of its proper divisors (122496210529).

1988959555487 is a wasteful number, since it uses less digits than its factorization.

1988959555487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305477217.

The product of its digits is 6531840000, while the sum is 83.

The spelling of 1988959555487 in words is "one trillion, nine hundred eighty-eight billion, nine hundred fifty-nine million, five hundred fifty-five thousand, four hundred eighty-seven".