1660601566 has 16 divisors (see below), whose sum is σ = 2722550544. Its totient is φ = 754991424.

The previous prime is 1660601561. The next prime is 1660601609. The reversal of 1660601566 is 6651060661.

It is a super-2 number, since 2×1660601566² = 5515195122003304712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660601561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474895 + ... + 478378.

It is an arithmetic number, because the mean of its divisors is an integer number (170159409).

Almost surely, 2^1660601566 is an apocalyptic number.

1660601566 is a deficient number, since it is larger than the sum of its proper divisors (1061948978).

1660601566 is a wasteful number, since it uses less digits than its factorization.

1660601566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953355.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1660601566 is about 40750.4793346042. The cubic root of 1660601566 is about 1184.1911590056.

The spelling of 1660601566 in words is "one billion, six hundred sixty million, six hundred one thousand, five hundred sixty-six".