1988017155157 has 8 divisors (see below), whose sum is σ = 2168762718240. Its totient is φ = 1807274380560.

The previous prime is 1988017155151. The next prime is 1988017155191. The reversal of 1988017155157 is 7515517108891.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-1988017155157 is a prime.

It is a Duffinian number.

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 in 7 ways as a sum of consecutive naturals, for example, 966118 + ... + 2215720.

It is an arithmetic number, because the mean of its divisors is an integer number (271095339780).

Almost surely, 2^{1988017155157} is an apocalyptic number.

It is an amenable number.

1988017155157 is a deficient number, since it is larger than the sum of its proper divisors (180745563083).

1988017155157 is a wasteful number, since it uses less digits than its factorization.

1988017155157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394243.

The product of its (nonzero) digits is 3528000, while the sum is 58.

The spelling of 1988017155157 in words is "one trillion, nine hundred eighty-eight billion, seventeen million, one hundred fifty-five thousand, one hundred fifty-seven".