10667661638 has 4 divisors (see below), whose sum is σ = 16001492460. Its totient is φ = 5333830818.

The previous prime is 10667661637. The next prime is 10667661649. The reversal of 10667661638 is 83616676601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83616676601 = 149 ⋅561185749.

It is a super-2 number, since 2×10667661638² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10667661637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666915408 + ... + 2666915411.

It is an arithmetic number, because the mean of its divisors is an integer number (4000373115).

Almost surely, 2^10667661638 is an apocalyptic number.

10667661638 is a deficient number, since it is larger than the sum of its proper divisors (5333830822).

10667661638 is an equidigital number, since it uses as much as digits as its factorization.

10667661638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5333830821.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 10667661638 in words is "ten billion, six hundred sixty-seven million, six hundred sixty-one thousand, six hundred thirty-eight".