161930760840 has 192 divisors, whose sum is σ = 530622144000. Its totient is φ = 42825908736.

The previous prime is 161930760829. The next prime is 161930760851. The reversal of 161930760840 is 48067039161.

It is a happy number.

161930760840 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 30 + 7 + 608 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (161930760829) and next prime (161930760851).

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

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, 33853089 + ... + 33857871.

It is an arithmetic number, because the mean of its divisors is an integer number (2763657000).

Almost surely, 2^161930760840 is an apocalyptic number.

161930760840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161930760840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265311072000).

161930760840 is an abundant number, since it is smaller than the sum of its proper divisors (368691383160).

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

161930760840 is a wasteful number, since it uses less digits than its factorization.

161930760840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556 (or 5549 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 161930760840 in words is "one hundred sixty-one billion, nine hundred thirty million, seven hundred sixty thousand, eight hundred forty".