145751661 has 12 divisors (see below), whose sum is σ = 229669440. Its totient is φ = 88334280.

The previous prime is 145751657. The next prime is 145751663. The reversal of 145751661 is 166157541.

It is a happy number.

145751661 is a `hidden beast` number, since 14 + 575 + 16 + 61 = 666.

It is not a de Polignac number, because 145751661 - 2² = 145751657 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145751663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 736021 + ... + 736218.

It is an arithmetic number, because the mean of its divisors is an integer number (19139120).

Almost surely, 2^145751661 is an apocalyptic number.

145751661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

145751661 is a deficient number, since it is larger than the sum of its proper divisors (83917779).

145751661 is a wasteful number, since it uses less digits than its factorization.

145751661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472256 (or 1472253 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 145751661 is about 12072.7652590448. The cubic root of 145751661 is about 526.2650201553.

The spelling of 145751661 in words is "one hundred forty-five million, seven hundred fifty-one thousand, six hundred sixty-one".