161526420 has 192 divisors, whose sum is σ = 557383680. Its totient is φ = 38505600.

The previous prime is 161526419. The next prime is 161526439. The reversal of 161526420 is 24625161.

161526420 is a `hidden beast` number, since 1 + 6 + 15 + 2 + 642 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 421549 + ... + 421931.

It is an arithmetic number, because the mean of its divisors is an integer number (2903040).

Almost surely, 2^161526420 is an apocalyptic number.

161526420 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 161526420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278691840).

161526420 is an abundant number, since it is smaller than the sum of its proper divisors (395857260).

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

161526420 is a wasteful number, since it uses less digits than its factorization.

161526420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 161526420 is about 12709.3044656267. The cubic root of 161526420 is about 544.6044544577.

The spelling of 161526420 in words is "one hundred sixty-one million, five hundred twenty-six thousand, four hundred twenty".