1620226655 has 8 divisors (see below), whose sum is σ = 1956656832. Its totient is φ = 1287924768.

The previous prime is 1620226631. The next prime is 1620226669. The reversal of 1620226655 is 5566220261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1620226655 - 2⁶ = 1620226591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031207 + ... + 1032776.

It is an arithmetic number, because the mean of its divisors is an integer number (244582104).

Almost surely, 2^1620226655 is an apocalyptic number.

1620226655 is a deficient number, since it is larger than the sum of its proper divisors (336430177).

1620226655 is a wasteful number, since it uses less digits than its factorization.

1620226655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064145.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1620226655 is about 40252.0391408932. The cubic root of 1620226655 is about 1174.5150629029.

The spelling of 1620226655 in words is "one billion, six hundred twenty million, two hundred twenty-six thousand, six hundred fifty-five".