1553117783 has 16 divisors (see below), whose sum is σ = 1794365760. Its totient is φ = 1316756736.

The previous prime is 1553117717. The next prime is 1553117789. The reversal of 1553117783 is 3877113551.

It is a cyclic number.

It is not a de Polignac number, because 1553117783 - 2¹⁰ = 1553116759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1553117783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553117789) 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, 557891 + ... + 560667.

It is an arithmetic number, because the mean of its divisors is an integer number (112147860).

Almost surely, 2^1553117783 is an apocalyptic number.

1553117783 is a deficient number, since it is larger than the sum of its proper divisors (241247977).

1553117783 is a wasteful number, since it uses less digits than its factorization.

1553117783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3626.

The product of its digits is 88200, while the sum is 41.

The square root of 1553117783 is about 39409.6153622438. The cubic root of 1553117783 is about 1158.0699630999.

The spelling of 1553117783 in words is "one billion, five hundred fifty-three million, one hundred seventeen thousand, seven hundred eighty-three".