661142053 has 48 divisors (see below), whose sum is σ = 852804288. Its totient is φ = 503539200.

The previous prime is 661142051. The next prime is 661142081. The reversal of 661142053 is 350241166.

It is not a de Polignac number, because 661142053 - 2¹ = 661142051 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 (661142051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2336050 + ... + 2336332.

It is an arithmetic number, because the mean of its divisors is an integer number (17766756).

Almost surely, 2^661142053 is an apocalyptic number.

It is an amenable number.

661142053 is a deficient number, since it is larger than the sum of its proper divisors (191662235).

661142053 is a wasteful number, since it uses less digits than its factorization.

661142053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 661142053 is about 25712.6827266235. The cubic root of 661142053 is about 871.1606708755.

The spelling of 661142053 in words is "six hundred sixty-one million, one hundred forty-two thousand, fifty-three".