1653041985 has 64 divisors (see below), whose sum is σ = 3139928064. Its totient is φ = 726681600.

The previous prime is 1653041983. The next prime is 1653041987. The reversal of 1653041985 is 5891403561.

It is an interprime number because it is at equal distance from previous prime (1653041983) and next prime (1653041987).

It is not a de Polignac number, because 1653041985 - 2¹ = 1653041983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1653041983) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 542065 + ... + 545105.

It is an arithmetic number, because the mean of its divisors is an integer number (49061376).

Almost surely, 2^1653041985 is an apocalyptic number.

1653041985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1653041985 is a deficient number, since it is larger than the sum of its proper divisors (1486886079).

1653041985 is a wasteful number, since it uses less digits than its factorization.

1653041985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 1653041985 is about 40657.6190276804. The cubic root of 1653041985 is about 1182.3914883883.

The spelling of 1653041985 in words is "one billion, six hundred fifty-three million, forty-one thousand, nine hundred eighty-five".