161987511330 has 48 divisors (see below), whose sum is σ = 421193485440. Its totient is φ = 43194007584.

The previous prime is 161987511299. The next prime is 161987511379. The reversal of 161987511330 is 33115789161.

161987511330 is a `hidden beast` number, since 16 + 1 + 98 + 7 + 511 + 3 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1730919 + ... + 1822101.

It is an arithmetic number, because the mean of its divisors is an integer number (8774864280).

Almost surely, 2^161987511330 is an apocalyptic number.

161987511330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161987511330 is an abundant number, since it is smaller than the sum of its proper divisors (259205974110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161987511330 is a wasteful number, since it uses less digits than its factorization.

161987511330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110935 (or 110932 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 161987511330 in words is "one hundred sixty-one billion, nine hundred eighty-seven million, five hundred eleven thousand, three hundred thirty".