621520066 has 8 divisors (see below), whose sum is σ = 955018764. Its totient is φ = 303180480.

The previous prime is 621520063. The next prime is 621520103. The reversal of 621520066 is 660025126.

It can be written as a sum of positive squares in 2 ways, for example, as 621455041 + 65025 = 24929^2 + 255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (621520063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3789675 + ... + 3789838.

Almost surely, 2^621520066 is an apocalyptic number.

621520066 is a deficient number, since it is larger than the sum of its proper divisors (333498698).

621520066 is a wasteful number, since it uses less digits than its factorization.

621520066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7579556.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 621520066 is about 24930.3041698251. The cubic root of 621520066 is about 853.3981915153.

The spelling of 621520066 in words is "six hundred twenty-one million, five hundred twenty thousand, sixty-six".