151665220 has 192 divisors, whose sum is σ = 416747520. Its totient is φ = 45163008.

The previous prime is 151665181. The next prime is 151665233. The reversal of 151665220 is 22566151.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2263627 + ... + 2263693.

It is an arithmetic number, because the mean of its divisors is an integer number (2170560).

Almost surely, 2^151665220 is an apocalyptic number.

151665220 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 151665220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208373760).

151665220 is an abundant number, since it is smaller than the sum of its proper divisors (265082300).

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

151665220 is a wasteful number, since it uses less digits than its factorization.

151665220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 151665220 is about 12315.2433999495. The cubic root of 151665220 is about 533.2882314291.

The spelling of 151665220 in words is "one hundred fifty-one million, six hundred sixty-five thousand, two hundred twenty".