1660469651 has 4 divisors (see below), whose sum is σ = 1661125152. Its totient is φ = 1659814152.

The previous prime is 1660469599. The next prime is 1660469653. The reversal of 1660469651 is 1569640661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1569640661 = 59 ⋅26604079.

It is a cyclic number.

It is not a de Polignac number, because 1660469651 - 2¹⁰ = 1660468627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660469653) 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, 323936 + ... + 329021.

It is an arithmetic number, because the mean of its divisors is an integer number (415281288).

Almost surely, 2^1660469651 is an apocalyptic number.

1660469651 is a deficient number, since it is larger than the sum of its proper divisors (655501).

1660469651 is an equidigital number, since it uses as much as digits as its factorization.

1660469651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655500.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 1660469651 is about 40748.8607325407. The cubic root of 1660469651 is about 1184.1598015512.

The spelling of 1660469651 in words is "one billion, six hundred sixty million, four hundred sixty-nine thousand, six hundred fifty-one".