1665351500 has 48 divisors (see below), whose sum is σ = 3735469920. Its totient is φ = 648129600.

The previous prime is 1665351491. The next prime is 1665351509. The reversal of 1665351500 is 51535661.

It is an interprime number because it is at equal distance from previous prime (1665351491) and next prime (1665351509).

It is not an unprimeable number, because it can be changed into a prime (1665351509) 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, 26510 + ... + 63509.

It is an arithmetic number, because the mean of its divisors is an integer number (77822290).

Almost surely, 2^1665351500 is an apocalyptic number.

1665351500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665351500 is an abundant number, since it is smaller than the sum of its proper divisors (2070118420).

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

1665351500 is a wasteful number, since it uses less digits than its factorization.

1665351500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90075 (or 90063 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 1665351500 is about 40808.7184312372. The cubic root of 1665351500 is about 1185.3191589303.

The spelling of 1665351500 in words is "one billion, six hundred sixty-five million, three hundred fifty-one thousand, five hundred".