1661516 has 6 divisors (see below), whose sum is σ = 2907660. Its totient is φ = 830756.

The previous prime is 1661503. The next prime is 1661519. The reversal of 1661516 is 6151661.

It is not an unprimeable number, because it can be changed into a prime (1661519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207686 + ... + 207693.

It is an arithmetic number, because the mean of its divisors is an integer number (484610).

2^1661516 is an apocalyptic number.

It is an amenable number.

1661516 is a deficient number, since it is larger than the sum of its proper divisors (1246144).

1661516 is a wasteful number, since it uses less digits than its factorization.

1661516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415383 (or 415381 counting only the distinct ones).

The product of its digits is 1080, while the sum is 26.

The square root of 1661516 is about 1288.9980605106. The cubic root of 1661516 is about 118.4408483052.

The spelling of 1661516 in words is "one million, six hundred sixty-one thousand, five hundred sixteen".