1665501501 has 16 divisors (see below), whose sum is σ = 2262611520. Its totient is φ = 1089434880.

The previous prime is 1665501491. The next prime is 1665501511. The reversal of 1665501501 is 1051055661.

It is an interprime number because it is at equal distance from previous prime (1665501491) and next prime (1665501511).

It is not a de Polignac number, because 1665501501 - 2⁶ = 1665501437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665501511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87061 + ... + 104453.

It is an arithmetic number, because the mean of its divisors is an integer number (141413220).

Almost surely, 2^1665501501 is an apocalyptic number.

It is an amenable number.

1665501501 is a deficient number, since it is larger than the sum of its proper divisors (597110019).

1665501501 is a wasteful number, since it uses less digits than its factorization.

1665501501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17996.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1665501501 is about 40810.5562446777. The cubic root of 1665501501 is about 1185.3547457561.

The spelling of 1665501501 in words is "one billion, six hundred sixty-five million, five hundred one thousand, five hundred one".