660537545 has 16 divisors (see below), whose sum is σ = 802947600. Its totient is φ = 521601024.

The previous prime is 660537517. The next prime is 660537547. The reversal of 660537545 is 545735066.

It can be written as a sum of positive squares in 8 ways, for example, as 2050624 + 658486921 = 1432^2 + 25661^2 .

It is a cyclic number.

It is not a de Polignac number, because 660537545 - 2⁶ = 660537481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660537547) 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, 142931 + ... + 147479.

It is an arithmetic number, because the mean of its divisors is an integer number (50184225).

Almost surely, 2^660537545 is an apocalyptic number.

It is an amenable number.

660537545 is a deficient number, since it is larger than the sum of its proper divisors (142410055).

660537545 is a wasteful number, since it uses less digits than its factorization.

660537545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924.

The product of its (nonzero) digits is 378000, while the sum is 41.

The square root of 660537545 is about 25700.9249833542. The cubic root of 660537545 is about 870.8950778368.

The spelling of 660537545 in words is "six hundred sixty million, five hundred thirty-seven thousand, five hundred forty-five".