651601650 has 96 divisors (see below), whose sum is σ = 1872344448. Its totient is φ = 146880000.

The previous prime is 651601607. The next prime is 651601651. The reversal of 651601650 is 56106156.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (651601651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72400 + ... + 80900.

It is an arithmetic number, because the mean of its divisors is an integer number (19503588).

Almost surely, 2^651601650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651601650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936172224).

651601650 is an abundant number, since it is smaller than the sum of its proper divisors (1220742798).

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

651601650 is a wasteful number, since it uses less digits than its factorization.

651601650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8596 (or 8591 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 651601650 is about 25526.4891828077. The cubic root of 651601650 is about 866.9500150113.

The spelling of 651601650 in words is "six hundred fifty-one million, six hundred one thousand, six hundred fifty".