1661540344 has 8 divisors (see below), whose sum is σ = 3115388160. Its totient is φ = 830770168.

The previous prime is 1661540341. The next prime is 1661540357. The reversal of 1661540344 is 4430451661.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661540341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103846264 + ... + 103846279.

It is an arithmetic number, because the mean of its divisors is an integer number (389423520).

Almost surely, 2^1661540344 is an apocalyptic number.

It is an amenable number.

1661540344 is a deficient number, since it is larger than the sum of its proper divisors (1453847816).

1661540344 is a wasteful number, since it uses less digits than its factorization.

1661540344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207692549 (or 207692545 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1661540344 is about 40761.9963201019. The cubic root of 1661540344 is about 1184.4142675480.

The spelling of 1661540344 in words is "one billion, six hundred sixty-one million, five hundred forty thousand, three hundred forty-four".