621662061 has 4 divisors (see below), whose sum is σ = 828882752. Its totient is φ = 414441372.

The previous prime is 621662047. The next prime is 621662077. The reversal of 621662061 is 160266126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 621662061 - 2¹⁰ = 621661037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621662081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103610341 + ... + 103610346.

It is an arithmetic number, because the mean of its divisors is an integer number (207220688).

Almost surely, 2^621662061 is an apocalyptic number.

It is an amenable number.

621662061 is a deficient number, since it is larger than the sum of its proper divisors (207220691).

621662061 is a wasteful number, since it uses less digits than its factorization.

621662061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207220690.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 621662061 is about 24933.1518464874. The cubic root of 621662061 is about 853.4631768396.

The spelling of 621662061 in words is "six hundred twenty-one million, six hundred sixty-two thousand, sixty-one".