621166033 has 4 divisors (see below), whose sum is σ = 621244260. Its totient is φ = 621087808.

The previous prime is 621166001. The next prime is 621166057. The reversal of 621166033 is 330661126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 415874449 + 205291584 = 20393^2 + 14328^2 .

It is a cyclic number.

It is not a de Polignac number, because 621166033 - 2⁵ = 621166001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621165992 and 621166010.

It is not an unprimeable number, because it can be changed into a prime (621166633) 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, 25660 + ... + 43597.

It is an arithmetic number, because the mean of its divisors is an integer number (155311065).

Almost surely, 2^621166033 is an apocalyptic number.

It is an amenable number.

621166033 is a deficient number, since it is larger than the sum of its proper divisors (78227).

621166033 is an equidigital number, since it uses as much as digits as its factorization.

621166033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78226.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 621166033 is about 24923.2027035050. The cubic root of 621166033 is about 853.2361219251.

The spelling of 621166033 in words is "six hundred twenty-one million, one hundred sixty-six thousand, thirty-three".