660167537 has 4 divisors (see below), whose sum is σ = 681463296. Its totient is φ = 638871780.

The previous prime is 660167531. The next prime is 660167561. The reversal of 660167537 is 735761066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 735761066 = 2 ⋅367880533.

It is a cyclic number.

It is not a de Polignac number, because 660167537 - 2¹⁰ = 660166513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660167494 and 660167503.

It is not an unprimeable number, because it can be changed into a prime (660167531) 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 3 ways as a sum of consecutive naturals, for example, 10647833 + ... + 10647894.

It is an arithmetic number, because the mean of its divisors is an integer number (170365824).

Almost surely, 2^660167537 is an apocalyptic number.

It is an amenable number.

660167537 is a deficient number, since it is larger than the sum of its proper divisors (21295759).

660167537 is a wasteful number, since it uses less digits than its factorization.

660167537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21295758.

The product of its (nonzero) digits is 158760, while the sum is 41.

The square root of 660167537 is about 25693.7256348705. The cubic root of 660167537 is about 870.7324333686.

The spelling of 660167537 in words is "six hundred sixty million, one hundred sixty-seven thousand, five hundred thirty-seven".