1661352736 has 24 divisors (see below), whose sum is σ = 3292458624. Its totient is φ = 825172800.

The previous prime is 1661352733. The next prime is 1661352743. The reversal of 1661352736 is 6372531661.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1661352731) 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, 167080 + ... + 176743.

It is an arithmetic number, because the mean of its divisors is an integer number (137185776).

Almost surely, 2^1661352736 is an apocalyptic number.

1661352736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1661352736 is a deficient number, since it is larger than the sum of its proper divisors (1631105888).

1661352736 is a wasteful number, since it uses less digits than its factorization.

1661352736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343984 (or 343976 counting only the distinct ones).

The product of its digits is 136080, while the sum is 40.

The square root of 1661352736 is about 40759.6949939521. The cubic root of 1661352736 is about 1184.3696876382.

The spelling of 1661352736 in words is "one billion, six hundred sixty-one million, three hundred fifty-two thousand, seven hundred thirty-six".