621665041 has 8 divisors (see below), whose sum is σ = 647609600. Its totient is φ = 596088720.

The previous prime is 621665029. The next prime is 621665059. The reversal of 621665041 is 140566126.

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

It is a cyclic number.

It is not a de Polignac number, because 621665041 - 2⁷ = 621664913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621664994 and 621665012.

It is not an unprimeable number, because it can be changed into a prime (621665071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88611 + ... + 95368.

It is an arithmetic number, because the mean of its divisors is an integer number (80951200).

Almost surely, 2^621665041 is an apocalyptic number.

It is an amenable number.

621665041 is a deficient number, since it is larger than the sum of its proper divisors (25944559).

621665041 is a wasteful number, since it uses less digits than its factorization.

621665041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184119.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 621665041 is about 24933.2116062091. The cubic root of 621665041 is about 853.4645405581.

The spelling of 621665041 in words is "six hundred twenty-one million, six hundred sixty-five thousand, forty-one".