1661524867 has 4 divisors (see below), whose sum is σ = 1662815160. Its totient is φ = 1660234576.

The previous prime is 1661524847. The next prime is 1661524883. The reversal of 1661524867 is 7684251661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661524867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661524817) 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, 643213 + ... + 645790.

It is an arithmetic number, because the mean of its divisors is an integer number (415703790).

Almost surely, 2^1661524867 is an apocalyptic number.

1661524867 is a deficient number, since it is larger than the sum of its proper divisors (1290293).

1661524867 is a wasteful number, since it uses less digits than its factorization.

1661524867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290292.

The product of its digits is 483840, while the sum is 46.

The square root of 1661524867 is about 40761.8064737077. The cubic root of 1661524867 is about 1184.4105899893.

The spelling of 1661524867 in words is "one billion, six hundred sixty-one million, five hundred twenty-four thousand, eight hundred sixty-seven".