1661053005 has 24 divisors (see below), whose sum is σ = 2972037120. Its totient is φ = 857316960.

The previous prime is 1661052971. The next prime is 1661053007. The reversal of 1661053005 is 5003501661.

It is a happy number.

1661053005 is a `hidden beast` number, since 16 + 610 + 5 + 30 + 0 + 5 = 666.

It is not a de Polignac number, because 1661053005 - 2¹⁵ = 1661020237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1661053005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661053007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 593965 + ... + 596754.

It is an arithmetic number, because the mean of its divisors is an integer number (123834880).

Almost surely, 2^1661053005 is an apocalyptic number.

1661053005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661053005 is a deficient number, since it is larger than the sum of its proper divisors (1310984115).

1661053005 is a wasteful number, since it uses less digits than its factorization.

1661053005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190761 (or 1190758 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1661053005 is about 40756.0180218824. The cubic root of 1661053005 is about 1184.2984577997.

Adding to 1661053005 its reverse (5003501661), we get a palindrome (6664554666).

The spelling of 1661053005 in words is "one billion, six hundred sixty-one million, fifty-three thousand, five".