651561552 has 30 divisors (see below), whose sum is σ = 1823467802. Its totient is φ = 217187136.

The previous prime is 651561551. The next prime is 651561571. The reversal of 651561552 is 255165156.

651561552 is a `hidden beast` number, since 6 + 51 + 56 + 1 + 552 = 666.

It can be written as a sum of positive squares in only one way, i.e., 645973056 + 5588496 = 25416^2 + 2364^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651561551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2262223 + ... + 2262510.

Almost surely, 2^651561552 is an apocalyptic number.

It is an amenable number.

651561552 is an abundant number, since it is smaller than the sum of its proper divisors (1171906250).

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

651561552 is a wasteful number, since it uses less digits than its factorization.

651561552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524747 (or 4524738 counting only the distinct ones).

The product of its digits is 45000, while the sum is 36.

The square root of 651561552 is about 25525.7037513170. The cubic root of 651561552 is about 866.9322313062.

The spelling of 651561552 in words is "six hundred fifty-one million, five hundred sixty-one thousand, five hundred fifty-two".