1988017155158 has 4 divisors (see below), whose sum is σ = 2982025732740. Its totient is φ = 994008577578.

The previous prime is 1988017155151. The next prime is 1988017155191. The reversal of 1988017155158 is 8515517108891.

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

It is a junction number, because it is equal to n+sod(n) for n = 1988017155097 and 1988017155106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988017155151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497004288788 + ... + 497004288791.

It is an arithmetic number, because the mean of its divisors is an integer number (745506433185).

Almost surely, 2^{1988017155158} is an apocalyptic number.

1988017155158 is a deficient number, since it is larger than the sum of its proper divisors (994008577582).

1988017155158 is an equidigital number, since it uses as much as digits as its factorization.

1988017155158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994008577581.

The product of its (nonzero) digits is 4032000, while the sum is 59.

The spelling of 1988017155158 in words is "one trillion, nine hundred eighty-eight billion, seventeen million, one hundred fifty-five thousand, one hundred fifty-eight".