145661057 has 4 divisors (see below), whose sum is σ = 145698900. Its totient is φ = 145623216.

The previous prime is 145661053. The next prime is 145661063. The reversal of 145661057 is 750166541.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82156096 + 63504961 = 9064^2 + 7969^2 .

It is a cyclic number.

It is not a de Polignac number, because 145661057 - 2² = 145661053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145661053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12398 + ... + 21095.

It is an arithmetic number, because the mean of its divisors is an integer number (36424725).

Almost surely, 2^145661057 is an apocalyptic number.

It is an amenable number.

145661057 is a deficient number, since it is larger than the sum of its proper divisors (37843).

145661057 is an equidigital number, since it uses as much as digits as its factorization.

145661057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37842.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 145661057 is about 12069.0122628159. The cubic root of 145661057 is about 526.1559497014.

The spelling of 145661057 in words is "one hundred forty-five million, six hundred sixty-one thousand, fifty-seven".