161155001940 has 24 divisors (see below), whose sum is σ = 451234005600. Its totient is φ = 42974667168.

The previous prime is 161155001911. The next prime is 161155001999. The reversal of 161155001940 is 49100551161.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1342958290 + ... + 1342958409.

It is an arithmetic number, because the mean of its divisors is an integer number (18801416900).

Almost surely, 2^161155001940 is an apocalyptic number.

161155001940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161155001940 is an abundant number, since it is smaller than the sum of its proper divisors (290079003660).

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

161155001940 is a wasteful number, since it uses less digits than its factorization.

161155001940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685916711 (or 2685916709 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 161155001940 in words is "one hundred sixty-one billion, one hundred fifty-five million, one thousand, nine hundred forty".