161306658589440 has 432 divisors, whose sum is σ = 637543110290688. Its totient is φ = 34033931403264.

The previous prime is 161306658589423. The next prime is 161306658589459. The reversal of 161306658589440 is 44985856603161.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13211694 + ... + 22297133.

It is an arithmetic number, because the mean of its divisors is an integer number (1475794236784).

Almost surely, 2^{161306658589440} is an apocalyptic number.

161306658589440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161306658589440 is an abundant number, since it is smaller than the sum of its proper divisors (476236451701248).

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

161306658589440 is a wasteful number, since it uses less digits than its factorization.

161306658589440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35508884 (or 35508857 counting only the distinct ones).

The product of its (nonzero) digits is 149299200, while the sum is 66.

The spelling of 161306658589440 in words is "one hundred sixty-one trillion, three hundred six billion, six hundred fifty-eight million, five hundred eighty-nine thousand, four hundred forty".