1666136403461 has 16 divisors (see below), whose sum is σ = 1782742800384. Its totient is φ = 1551621636864.

The previous prime is 1666136403457. The next prime is 1666136403473. The reversal of 1666136403461 is 1643046316661.

It is not a de Polignac number, because 1666136403461 - 2² = 1666136403457 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666136403401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1731740 + ... + 2516186.

It is an arithmetic number, because the mean of its divisors is an integer number (111421425024).

Almost surely, 2^{1666136403461} is an apocalyptic number.

It is an amenable number.

1666136403461 is a deficient number, since it is larger than the sum of its proper divisors (116606396923).

1666136403461 is a wasteful number, since it uses less digits than its factorization.

1666136403461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785780.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 1666136403461 in words is "one trillion, six hundred sixty-six billion, one hundred thirty-six million, four hundred three thousand, four hundred sixty-one".