145981667 has 8 divisors (see below), whose sum is σ = 164046624. Its totient is φ = 128893248.

The previous prime is 145981637. The next prime is 145981673. The reversal of 145981667 is 766189541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145981667 - 2¹⁴ = 145965283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145981637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243818 + ... + 244415.

It is an arithmetic number, because the mean of its divisors is an integer number (20505828).

Almost surely, 2^145981667 is an apocalyptic number.

145981667 is a deficient number, since it is larger than the sum of its proper divisors (18064957).

145981667 is a wasteful number, since it uses less digits than its factorization.

145981667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488269.

The product of its digits is 362880, while the sum is 47.

The square root of 145981667 is about 12082.2873248404. The cubic root of 145981667 is about 526.5417019560.

The spelling of 145981667 in words is "one hundred forty-five million, nine hundred eighty-one thousand, six hundred sixty-seven".