1610268661 has 4 divisors (see below), whose sum is σ = 1611153792. Its totient is φ = 1609383532.

The previous prime is 1610268659. The next prime is 1610268683. The reversal of 1610268661 is 1668620161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1668620161 = 13 ⋅128355397.

It is a cyclic number.

It is not a de Polignac number, because 1610268661 - 2¹ = 1610268659 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 1610268661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1610268691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439831 + ... + 443476.

It is an arithmetic number, because the mean of its divisors is an integer number (402788448).

Almost surely, 2^1610268661 is an apocalyptic number.

It is an amenable number.

1610268661 is a deficient number, since it is larger than the sum of its proper divisors (885131).

1610268661 is an equidigital number, since it uses as much as digits as its factorization.

1610268661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885130.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1610268661 is about 40128.1529726949. The cubic root of 1610268661 is about 1172.1039070145.

The spelling of 1610268661 in words is "one billion, six hundred ten million, two hundred sixty-eight thousand, six hundred sixty-one".