145220655 has 16 divisors (see below), whose sum is σ = 232861824. Its totient is φ = 77281440.

The previous prime is 145220651. The next prime is 145220657. The reversal of 145220655 is 556022541.

It is not a de Polignac number, because 145220655 - 2² = 145220651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145220651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3361 + ... + 17370.

It is an arithmetic number, because the mean of its divisors is an integer number (14553864).

Almost surely, 2^145220655 is an apocalyptic number.

145220655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145220655 is a deficient number, since it is larger than the sum of its proper divisors (87641169).

145220655 is a wasteful number, since it uses less digits than its factorization.

145220655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21206.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 145220655 is about 12050.7532959562. The cubic root of 145220655 is about 525.6251419402.

The spelling of 145220655 in words is "one hundred forty-five million, two hundred twenty thousand, six hundred fifty-five".