145381665 has 32 divisors (see below), whose sum is σ = 273280896. Its totient is φ = 65064960.

The previous prime is 145381651. The next prime is 145381699. The reversal of 145381665 is 566183541.

It is not a de Polignac number, because 145381665 - 2⁵ = 145381633 is a prime.

It is a super-2 number, since 2×145381665² = 42271657036344450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31744 + ... + 36033.

It is an arithmetic number, because the mean of its divisors is an integer number (8540028).

Almost surely, 2^145381665 is an apocalyptic number.

145381665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145381665 is a deficient number, since it is larger than the sum of its proper divisors (127899231).

145381665 is a wasteful number, since it uses less digits than its factorization.

145381665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67809.

The product of its digits is 86400, while the sum is 39.

The square root of 145381665 is about 12057.4319405087. The cubic root of 145381665 is about 525.8193283798.

The spelling of 145381665 in words is "one hundred forty-five million, three hundred eighty-one thousand, six hundred sixty-five".