1610661601 has 4 divisors (see below), whose sum is σ = 1613753604. Its totient is φ = 1607569600.

The previous prime is 1610661599. The next prime is 1610661607. The reversal of 1610661601 is 1061660161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 307090576 + 1303571025 = 17524^2 + 36105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1610661601 - 2¹ = 1610661599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1610661601.

It is not an unprimeable number, because it can be changed into a prime (1610661607) 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, 1545220 + ... + 1546261.

It is an arithmetic number, because the mean of its divisors is an integer number (403438401).

Almost surely, 2^1610661601 is an apocalyptic number.

It is an amenable number.

1610661601 is a deficient number, since it is larger than the sum of its proper divisors (3092003).

1610661601 is an equidigital number, since it uses as much as digits as its factorization.

1610661601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092002.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1610661601 is about 40133.0487379167. The cubic root of 1610661601 is about 1172.1992387362.

The spelling of 1610661601 in words is "one billion, six hundred ten million, six hundred sixty-one thousand, six hundred one".