1661600501 has 8 divisors (see below), whose sum is σ = 1875160800. Its totient is φ = 1458457840.

The previous prime is 1661600491. The next prime is 1661600503. The reversal of 1661600501 is 1050061661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661600501 - 2¹⁴ = 1661584117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661600503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2604071 + ... + 2604708.

It is an arithmetic number, because the mean of its divisors is an integer number (234395100).

Almost surely, 2^1661600501 is an apocalyptic number.

1661600501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1661600501 is a deficient number, since it is larger than the sum of its proper divisors (213560299).

1661600501 is a wasteful number, since it uses less digits than its factorization.

1661600501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5208819.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1661600501 is about 40762.7342188916. The cubic root of 1661600501 is about 1184.4285615031.

The spelling of 1661600501 in words is "one billion, six hundred sixty-one million, six hundred thousand, five hundred one".