1660428001 has 4 divisors (see below), whose sum is σ = 1667043504. Its totient is φ = 1653812500.

The previous prime is 1660427999. The next prime is 1660428019. The reversal of 1660428001 is 1008240661.

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.

It is a cyclic number.

It is not a de Polignac number, because 1660428001 - 2¹ = 1660427999 is a prime.

It is a super-3 number, since 3×1660428001³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660423001) 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, 3307375 + ... + 3307876.

It is an arithmetic number, because the mean of its divisors is an integer number (416760876).

Almost surely, 2^1660428001 is an apocalyptic number.

It is an amenable number.

1660428001 is a deficient number, since it is larger than the sum of its proper divisors (6615503).

1660428001 is an equidigital number, since it uses as much as digits as its factorization.

1660428001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6615502.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1660428001 is about 40748.3496721033. The cubic root of 1660428001 is about 1184.1499006038.

Adding to 1660428001 its reverse (1008240661), we get a palindrome (2668668662).

The spelling of 1660428001 in words is "one billion, six hundred sixty million, four hundred twenty-eight thousand, one".