651151620 has 144 divisors (see below), whose sum is σ = 2355575040. Its totient is φ = 142357248.

The previous prime is 651151601. The next prime is 651151639. The reversal of 651151620 is 26151156.

It is a happy number.

651151620 is a `hidden beast` number, since 651 + 1 + 5 + 1 + 6 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (651151601) and next prime (651151639).

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, 17746 + ... + 40214.

It is an arithmetic number, because the mean of its divisors is an integer number (16358160).

Almost surely, 2^651151620 is an apocalyptic number.

651151620 is a gapful number since it is divisible by the number (60) 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 651151620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177787520).

651151620 is an abundant number, since it is smaller than the sum of its proper divisors (1704423420).

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

651151620 is a wasteful number, since it uses less digits than its factorization.

651151620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22514 (or 22509 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 651151620 is about 25517.6726995234. The cubic root of 651151620 is about 866.7503821171.

The spelling of 651151620 in words is "six hundred fifty-one million, one hundred fifty-one thousand, six hundred twenty".