332001661 has 4 divisors (see below), whose sum is σ = 342711424. Its totient is φ = 321291900.

The previous prime is 332001647. The next prime is 332001671. The reversal of 332001661 is 166100233.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166100233 = 13 ⋅12776941.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-332001661 is a prime.

It is a super-2 number, since 2×332001661² = 220450205813517842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (332001601) 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, 5354835 + ... + 5354896.

It is an arithmetic number, because the mean of its divisors is an integer number (85677856).

Almost surely, 2^332001661 is an apocalyptic number.

332001661 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

332001661 is a deficient number, since it is larger than the sum of its proper divisors (10709763).

332001661 is a wasteful number, since it uses less digits than its factorization.

332001661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10709762.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 332001661 is about 18220.9127378405. The cubic root of 332001661 is about 692.4367120153.

Adding to 332001661 its reverse (166100233), we get a palindrome (498101894).

The spelling of 332001661 in words is "three hundred thirty-two million, one thousand, six hundred sixty-one".