655721052 has 72 divisors (see below), whose sum is σ = 1807037568. Its totient is φ = 181283040.

The previous prime is 655721047. The next prime is 655721057. The reversal of 655721052 is 250127556.

It is an interprime number because it is at equal distance from previous prime (655721047) and next prime (655721057).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655721057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76663 + ... + 84785.

It is an arithmetic number, because the mean of its divisors is an integer number (25097744).

Almost surely, 2^655721052 is an apocalyptic number.

655721052 is a gapful number since it is divisible by the number (62) 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 655721052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903518784).

655721052 is an abundant number, since it is smaller than the sum of its proper divisors (1151316516).

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

655721052 is a wasteful number, since it uses less digits than its factorization.

655721052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8199 (or 8166 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 655721052 is about 25607.0508258956. The cubic root of 655721052 is about 868.7731207069.

The spelling of 655721052 in words is "six hundred fifty-five million, seven hundred twenty-one thousand, fifty-two".