641454066 has 80 divisors (see below), whose sum is σ = 1589800608. Its totient is φ = 191678400.

The previous prime is 641454049. The next prime is 641454067. The reversal of 641454066 is 660454146.

641454066 is a `hidden beast` number, since 641 + 4 + 5 + 4 + 0 + 6 + 6 = 666.

It is a super-2 number, since 2×641454066² = 822926637575864712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641454066.

It is not an unprimeable number, because it can be changed into a prime (641454067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 127621 + ... + 132551.

Almost surely, 2^641454066 is an apocalyptic number.

641454066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 641454066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (794900304).

641454066 is an abundant number, since it is smaller than the sum of its proper divisors (948346542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641454066 is a wasteful number, since it uses less digits than its factorization.

641454066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5029 (or 5020 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 641454066 is about 25326.9434792278. The cubic root of 641454066 is about 862.4260261699.

The spelling of 641454066 in words is "six hundred forty-one million, four hundred fifty-four thousand, sixty-six".