1655647253 has 4 divisors (see below), whose sum is σ = 1783004748. Its totient is φ = 1528289760.

The previous prime is 1655647243. The next prime is 1655647261. The reversal of 1655647253 is 3527465561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3527465561 = 1013 ⋅3482197.

It can be written as a sum of positive squares in 2 ways, for example, as 70174129 + 1585473124 = 8377^2 + 39818^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655647253 - 2⁴ = 1655647237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655647243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63678728 + ... + 63678753.

It is an arithmetic number, because the mean of its divisors is an integer number (445751187).

Almost surely, 2^1655647253 is an apocalyptic number.

1655647253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1655647253 is a deficient number, since it is larger than the sum of its proper divisors (127357495).

1655647253 is a wasteful number, since it uses less digits than its factorization.

1655647253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127357494.

The product of its digits is 756000, while the sum is 44.

The square root of 1655647253 is about 40689.6455256125. The cubic root of 1655647253 is about 1183.0123296099.

The spelling of 1655647253 in words is "one billion, six hundred fifty-five million, six hundred forty-seven thousand, two hundred fifty-three".