145621665641 has 32 divisors (see below), whose sum is σ = 159243211008. Its totient is φ = 132768979200.

The previous prime is 145621665599. The next prime is 145621665643. The reversal of 145621665641 is 146566126541.

It is a cyclic number.

It is not a de Polignac number, because 145621665641 - 2⁶ = 145621665577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145621665643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35945066 + ... + 35949116.

It is an arithmetic number, because the mean of its divisors is an integer number (4976350344).

Almost surely, 2^145621665641 is an apocalyptic number.

It is an amenable number.

145621665641 is a deficient number, since it is larger than the sum of its proper divisors (13621545367).

145621665641 is a wasteful number, since it uses less digits than its factorization.

145621665641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961.

The product of its digits is 1036800, while the sum is 47.

The spelling of 145621665641 in words is "one hundred forty-five billion, six hundred twenty-one million, six hundred sixty-five thousand, six hundred forty-one".