1662535988 has 6 divisors (see below), whose sum is σ = 2909437986. Its totient is φ = 831267992.

The previous prime is 1662535951. The next prime is 1662535999. The reversal of 1662535988 is 8895352661.

It can be written as a sum of positive squares in only one way, i.e., 1042127524 + 620408464 = 32282^2 + 24908^2 .

It is a super-2 number, since 2×1662535988² = 5528051822790272288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207816995 + ... + 207817002.

It is an arithmetic number, because the mean of its divisors is an integer number (484906331).

Almost surely, 2^1662535988 is an apocalyptic number.

It is an amenable number.

1662535988 is a deficient number, since it is larger than the sum of its proper divisors (1246901998).

1662535988 is a wasteful number, since it uses less digits than its factorization.

1662535988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415634001 (or 415633999 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 53.

The square root of 1662535988 is about 40774.2073865330. The cubic root of 1662535988 is about 1184.6507989676.

The spelling of 1662535988 in words is "one billion, six hundred sixty-two million, five hundred thirty-five thousand, nine hundred eighty-eight".