1655561745 has 48 divisors (see below), whose sum is σ = 3068088192. Its totient is φ = 822919680.

The previous prime is 1655561737. The next prime is 1655561749. The reversal of 1655561745 is 5471655561.

It is a happy number.

1655561745 is a `hidden beast` number, since 16 + 5 + 5 + 561 + 74 + 5 = 666.

It is not a de Polignac number, because 1655561745 - 2³ = 1655561737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1655561745.

It is not an unprimeable number, because it can be changed into a prime (1655561749) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68290 + ... + 89300.

It is an arithmetic number, because the mean of its divisors is an integer number (63918504).

Almost surely, 2^1655561745 is an apocalyptic number.

1655561745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1655561745 is a deficient number, since it is larger than the sum of its proper divisors (1412526447).

1655561745 is a wasteful number, since it uses less digits than its factorization.

1655561745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21142 (or 21139 counting only the distinct ones).

The product of its digits is 630000, while the sum is 45.

The square root of 1655561745 is about 40688.5947778981. The cubic root of 1655561745 is about 1182.9919632025.

The spelling of 1655561745 in words is "one billion, six hundred fifty-five million, five hundred sixty-one thousand, seven hundred forty-five".