1655506605 has 16 divisors (see below), whose sum is σ = 2669033664. Its totient is φ = 876195840.

The previous prime is 1655506583. The next prime is 1655506607. The reversal of 1655506605 is 5066055561.

It is not a de Polignac number, because 1655506605 - 2¹⁶ = 1655441069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655506607) 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, 419284 + ... + 423213.

It is an arithmetic number, because the mean of its divisors is an integer number (166814604).

Almost surely, 2^1655506605 is an apocalyptic number.

1655506605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1655506605 is a deficient number, since it is larger than the sum of its proper divisors (1013527059).

1655506605 is a wasteful number, since it uses less digits than its factorization.

1655506605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842636.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 1655506605 is about 40687.9171868013. The cubic root of 1655506605 is about 1182.9788295131.

The spelling of 1655506605 in words is "one billion, six hundred fifty-five million, five hundred six thousand, six hundred five".