2621556630 has 128 divisors (see below), whose sum is σ = 8715893760. Its totient is φ = 544734720.

The previous prime is 2621556611. The next prime is 2621556631. The reversal of 2621556630 is 366551262.

It is a happy number.

2621556630 is a `hidden beast` number, since 2 + 6 + 2 + 15 + 5 + 6 + 630 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621556631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42259 + ... + 83838.

It is an arithmetic number, because the mean of its divisors is an integer number (68092920).

Almost surely, 2^2621556630 is an apocalyptic number.

2621556630 is an abundant number, since it is smaller than the sum of its proper divisors (6094337130).

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

2621556630 is a wasteful number, since it uses less digits than its factorization.

2621556630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126131 (or 126125 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 2621556630 is about 51201.1389521757. The cubic root of 2621556630 is about 1378.8586498619.

The spelling of 2621556630 in words is "two billion, six hundred twenty-one million, five hundred fifty-six thousand, six hundred thirty".