145767681 has 24 divisors (see below), whose sum is σ = 219046464. Its totient is φ = 96869520.

The previous prime is 145767667. The next prime is 145767683. The reversal of 145767681 is 186767541.

145767681 is a `hidden beast` number, since 1 + 4 + 576 + 76 + 8 + 1 = 666.

It is not a de Polignac number, because 145767681 - 2¹⁷ = 145636609 is a prime.

It is a super-2 number, since 2×145767681² = 42496433648235522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145767683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95716 + ... + 97226.

It is an arithmetic number, because the mean of its divisors is an integer number (9126936).

Almost surely, 2^145767681 is an apocalyptic number.

It is an amenable number.

145767681 is a deficient number, since it is larger than the sum of its proper divisors (73278783).

145767681 is an equidigital number, since it uses as much as digits as its factorization.

145767681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923 (or 1911 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 145767681 is about 12073.4287176427. The cubic root of 145767681 is about 526.2843005685.

The spelling of 145767681 in words is "one hundred forty-five million, seven hundred sixty-seven thousand, six hundred eighty-one".