161345351640 has 128 divisors (see below), whose sum is σ = 540319507200. Its totient is φ = 38204382720.

The previous prime is 161345351633. The next prime is 161345351711. The reversal of 161345351640 is 46153543161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1364535 + ... + 1478054.

It is an arithmetic number, because the mean of its divisors is an integer number (4221246150).

Almost surely, 2^161345351640 is an apocalyptic number.

161345351640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161345351640 is an abundant number, since it is smaller than the sum of its proper divisors (378974155560).

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

161345351640 is a wasteful number, since it uses less digits than its factorization.

161345351640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842657 (or 2842653 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 161345351640 in words is "one hundred sixty-one billion, three hundred forty-five million, three hundred fifty-one thousand, six hundred forty".