201651616 has 72 divisors (see below), whose sum is σ = 421424640. Its totient is φ = 94945536.

The previous prime is 201651613. The next prime is 201651631. The reversal of 201651616 is 616156102.

It is a super-2 number, since 2×201651616² = 81326748470822912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201651613) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1587745 + ... + 1587871.

It is an arithmetic number, because the mean of its divisors is an integer number (5853120).

Almost surely, 2^201651616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201651616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210712320).

201651616 is an abundant number, since it is smaller than the sum of its proper divisors (219773024).

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

201651616 is a wasteful number, since it uses less digits than its factorization.

201651616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 201651616 is about 14200.4090081941. The cubic root of 201651616 is about 586.4089214440.

The spelling of 201651616 in words is "two hundred one million, six hundred fifty-one thousand, six hundred sixteen".