10661343940 has 24 divisors (see below), whose sum is σ = 24111039960. Its totient is φ = 3936496128.

The previous prime is 10661343919. The next prime is 10661343989. The reversal of 10661343940 is 4934316601.

It can be written as a sum of positive squares in 4 ways, for example, as 114875524 + 10546468416 = 10718^2 + 102696^2 .

It is a super-2 number, since 2×10661343940² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 10661343940.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20502325 + ... + 20502844.

It is an arithmetic number, because the mean of its divisors is an integer number (1004626665).

Almost surely, 2^10661343940 is an apocalyptic number.

10661343940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10661343940 is an abundant number, since it is smaller than the sum of its proper divisors (13449696020).

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

10661343940 is a wasteful number, since it uses less digits than its factorization.

10661343940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41005191 (or 41005189 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 10661343940 in words is "ten billion, six hundred sixty-one million, three hundred forty-three thousand, nine hundred forty".