651616452 has 36 divisors (see below), whose sum is σ = 1647918636. Its totient is φ = 217103040.

The previous prime is 651616451. The next prime is 651616463. The reversal of 651616452 is 254616156.

651616452 is a `hidden beast` number, since 6 + 5 + 1 + 6 + 1 + 645 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 392277636 + 259338816 = 19806^2 + 16104^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (651616451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138702 + ... + 143322.

Almost surely, 2^651616452 is an apocalyptic number.

It is an amenable number.

651616452 is an abundant number, since it is smaller than the sum of its proper divisors (996302184).

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

651616452 is a wasteful number, since it uses less digits than its factorization.

651616452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8548 (or 8543 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 651616452 is about 25526.7791152742. The cubic root of 651616452 is about 866.9565796033.

The spelling of 651616452 in words is "six hundred fifty-one million, six hundred sixteen thousand, four hundred fifty-two".