1656661413 has 16 divisors (see below), whose sum is σ = 2450534400. Its totient is φ = 987018480.

The previous prime is 1656661399. The next prime is 1656661429. The reversal of 1656661413 is 3141666561.

It is not a de Polignac number, because 1656661413 - 2¹³ = 1656653221 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 (1656661493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423493 + ... + 427386.

It is an arithmetic number, because the mean of its divisors is an integer number (153158400).

Almost surely, 2^1656661413 is an apocalyptic number.

It is an amenable number.

1656661413 is a deficient number, since it is larger than the sum of its proper divisors (793872987).

1656661413 is a wasteful number, since it uses less digits than its factorization.

1656661413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850952.

The product of its digits is 77760, while the sum is 39.

The square root of 1656661413 is about 40702.1057563365. The cubic root of 1656661413 is about 1183.2538301057.

The spelling of 1656661413 in words is "one billion, six hundred fifty-six million, six hundred sixty-one thousand, four hundred thirteen".