1613220165 has 64 divisors (see below), whose sum is σ = 2973484800. Its totient is φ = 829170432.

The previous prime is 1613220163. The next prime is 1613220179. The reversal of 1613220165 is 5610223161.

It is not a de Polignac number, because 1613220165 - 2¹ = 1613220163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613220163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 542974 + ... + 545936.

It is an arithmetic number, because the mean of its divisors is an integer number (46460700).

Almost surely, 2^1613220165 is an apocalyptic number.

1613220165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1613220165 is a deficient number, since it is larger than the sum of its proper divisors (1360264635).

1613220165 is a wasteful number, since it uses less digits than its factorization.

1613220165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123 (or 3117 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1613220165 is about 40164.9121124396. The cubic root of 1613220165 is about 1172.8195966698.

The spelling of 1613220165 in words is "one billion, six hundred thirteen million, two hundred twenty thousand, one hundred sixty-five".