145666397506 has 32 divisors (see below), whose sum is σ = 264955069440. Its totient is φ = 58633483776.

The previous prime is 145666397501. The next prime is 145666397509. The reversal of 145666397506 is 605793666541.

It is not an unprimeable number, because it can be changed into a prime (145666397501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524875 + ... + 752878.

It is an arithmetic number, because the mean of its divisors is an integer number (8279845920).

Almost surely, 2^145666397506 is an apocalyptic number.

145666397506 is a deficient number, since it is larger than the sum of its proper divisors (119288671934).

145666397506 is a wasteful number, since it uses less digits than its factorization.

145666397506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278258.

The product of its (nonzero) digits is 24494400, while the sum is 58.

The spelling of 145666397506 in words is "one hundred forty-five billion, six hundred sixty-six million, three hundred ninety-seven thousand, five hundred six".