1666400010610 has 16 divisors (see below), whose sum is σ = 2999545813656. Its totient is φ = 666554272128.

The previous prime is 1666400010593. The next prime is 1666400010673. The reversal of 1666400010610 is 160100046661.

It can be written as a sum of positive squares in 4 ways, for example, as 579274732201 + 1087125278409 = 761101^2 + 1042653^2 .

It is a super-4 number, since 4×1666400010610⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623884 + ... + 1929256.

Almost surely, 2^{1666400010610} is an apocalyptic number.

1666400010610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666400010610 is a deficient number, since it is larger than the sum of its proper divisors (1333145803046).

1666400010610 is a wasteful number, since it uses less digits than its factorization.

1666400010610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433037.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 1666400010610 in words is "one trillion, six hundred sixty-six billion, four hundred million, ten thousand, six hundred ten".