621450663 has 16 divisors (see below), whose sum is σ = 848660736. Its totient is φ = 404288640.

The previous prime is 621450659. The next prime is 621450673. The reversal of 621450663 is 366054126.

It is not a de Polignac number, because 621450663 - 2² = 621450659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621450673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227878 + ... + 230588.

It is an arithmetic number, because the mean of its divisors is an integer number (53041296).

Almost surely, 2^621450663 is an apocalyptic number.

621450663 is a deficient number, since it is larger than the sum of its proper divisors (227210073).

621450663 is a wasteful number, since it uses less digits than its factorization.

621450663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4534.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 621450663 is about 24928.9121904667. The cubic root of 621450663 is about 853.3664249896.

The spelling of 621450663 in words is "six hundred twenty-one million, four hundred fifty thousand, six hundred sixty-three".