660470749 has 2 divisors, whose sum is σ = 660470750. Its totient is φ = 660470748.

The previous prime is 660470687. The next prime is 660470773. The reversal of 660470749 is 947074066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 610979524 + 49491225 = 24718^2 + 7035^2 .

It is a cyclic number.

It is not a de Polignac number, because 660470749 - 2¹³ = 660462557 is a prime.

It is a super-2 number, since 2×660470749² = 872443220569242002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660470849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330235374 + 330235375.

It is an arithmetic number, because the mean of its divisors is an integer number (330235375).

Almost surely, 2^660470749 is an apocalyptic number.

It is an amenable number.

660470749 is a deficient number, since it is larger than the sum of its proper divisors (1).

660470749 is an equidigital number, since it uses as much as digits as its factorization.

660470749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 660470749 is about 25699.6254641969. The cubic root of 660470749 is about 870.8657208032.

The spelling of 660470749 in words is "six hundred sixty million, four hundred seventy thousand, seven hundred forty-nine".