1665506010 has 64 divisors (see below), whose sum is σ = 4576684032. Its totient is φ = 379983936.

The previous prime is 1665505993. The next prime is 1665506027. The reversal of 1665506010 is 106055661.

It is an interprime number because it is at equal distance from previous prime (1665505993) and next prime (1665506027).

It is a super-2 number, since 2×1665506010² = 5547820538692240200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111187 + ... + 125273.

It is an arithmetic number, because the mean of its divisors is an integer number (71510688).

Almost surely, 2^1665506010 is an apocalyptic number.

1665506010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665506010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2288342016).

1665506010 is an abundant number, since it is smaller than the sum of its proper divisors (2911178022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665506010 is a wasteful number, since it uses less digits than its factorization.

1665506010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14667.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1665506010 is about 40810.6114877001. The cubic root of 1665506010 is about 1185.3558154558.

The spelling of 1665506010 in words is "one billion, six hundred sixty-five million, five hundred six thousand, ten".