1604664061 has 32 divisors (see below), whose sum is σ = 2159474688. Its totient is φ = 1151547840.

The previous prime is 1604664049. The next prime is 1604664077.

1604664061 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1604664061 - 2⁵ = 1604664029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604664041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 501910 + ... + 505096.

It is an arithmetic number, because the mean of its divisors is an integer number (67483584).

Almost surely, 2^1604664061 is an apocalyptic number.

1604664061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1604664061 is a deficient number, since it is larger than the sum of its proper divisors (554810627).

1604664061 is a wasteful number, since it uses less digits than its factorization.

1604664061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3721.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1604664061 is about 40058.2583370770. The cubic root of 1604664061 is about 1170.7424758642.

The spelling of 1604664061 in words is "one billion, six hundred four million, six hundred sixty-four thousand, sixty-one".