1667611001 has 4 divisors (see below), whose sum is σ = 1905841152. Its totient is φ = 1429380852.

The previous prime is 1667610961. The next prime is 1667611007. The reversal of 1667611001 is 1001167661.

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 a de Polignac number, because none of the positive numbers 2^k-1667611001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1667611007) 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, 119115065 + ... + 119115078.

It is an arithmetic number, because the mean of its divisors is an integer number (476460288).

Almost surely, 2^1667611001 is an apocalyptic number.

It is an amenable number.

1667611001 is a deficient number, since it is larger than the sum of its proper divisors (238230151).

1667611001 is an equidigital number, since it uses as much as digits as its factorization.

1667611001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238230150.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1667611001 is about 40836.3930948854. The cubic root of 1667611001 is about 1185.8549856489.

Adding to 1667611001 its reverse (1001167661), we get a palindrome (2668778662).

It can be divided in two parts, 166 and 7611001, that added together give a palindrome (7611167).

The spelling of 1667611001 in words is "one billion, six hundred sixty-seven million, six hundred eleven thousand, one".