661005099982 has 16 divisors (see below), whose sum is σ = 994808661840. Its totient is φ = 329403140352.

The previous prime is 661005099949. The next prime is 661005099983. The reversal of 661005099982 is 289990500166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661005099983) 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, 1201753 + ... + 1663195.

It is an arithmetic number, because the mean of its divisors is an integer number (62175541365).

Almost surely, 2^661005099982 is an apocalyptic number.

661005099982 is a deficient number, since it is larger than the sum of its proper divisors (333803561858).

661005099982 is a wasteful number, since it uses less digits than its factorization.

661005099982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463827.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 661005099982 in words is "six hundred sixty-one billion, five million, ninety-nine thousand, nine hundred eighty-two".