1665146501 has 2 divisors, whose sum is σ = 1665146502. Its totient is φ = 1665146500.

The previous prime is 1665146477. The next prime is 1665146543. The reversal of 1665146501 is 1056415661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1434136900 + 231009601 = 37870^2 + 15199^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665146501 - 2²² = 1660952197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665146591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832573250 + 832573251.

It is an arithmetic number, because the mean of its divisors is an integer number (832573251).

Almost surely, 2^1665146501 is an apocalyptic number.

It is an amenable number.

1665146501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665146501 is an equidigital number, since it uses as much as digits as its factorization.

1665146501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 1665146501 is about 40806.2066480088. The cubic root of 1665146501 is about 1185.2705207072.

The spelling of 1665146501 in words is "one billion, six hundred sixty-five million, one hundred forty-six thousand, five hundred one".