661612053 has 16 divisors (see below), whose sum is σ = 929292800. Its totient is φ = 417538800.

The previous prime is 661612051. The next prime is 661612079. The reversal of 661612053 is 350216166.

It is not a de Polignac number, because 661612053 - 2¹ = 661612051 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 661612053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661612051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86328 + ... + 93678.

It is an arithmetic number, because the mean of its divisors is an integer number (58080800).

Almost surely, 2^661612053 is an apocalyptic number.

It is an amenable number.

661612053 is a deficient number, since it is larger than the sum of its proper divisors (267680747).

661612053 is a wasteful number, since it uses less digits than its factorization.

661612053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8952.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 661612053 is about 25721.8205615388. The cubic root of 661612053 is about 871.3670554328.

The spelling of 661612053 in words is "six hundred sixty-one million, six hundred twelve thousand, fifty-three".