1661540592 has 20 divisors (see below), whose sum is σ = 4292313320. Its totient is φ = 553846848.

The previous prime is 1661540581. The next prime is 1661540593. The reversal of 1661540592 is 2950451661.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1661540592.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661540593) 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, 17307667 + ... + 17307762.

It is an arithmetic number, because the mean of its divisors is an integer number (214615666).

Almost surely, 2^1661540592 is an apocalyptic number.

1661540592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1661540592 is an abundant number, since it is smaller than the sum of its proper divisors (2630772728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661540592 is a wasteful number, since it uses less digits than its factorization.

1661540592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34615440 (or 34615434 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 1661540592 is about 40761.9993621510. Note that the first 3 decimals coincide. The cubic root of 1661540592 is about 1184.4143264762.

The spelling of 1661540592 in words is "one billion, six hundred sixty-one million, five hundred forty thousand, five hundred ninety-two".