664280537 has 2 divisors, whose sum is σ = 664280538. Its totient is φ = 664280536.

The previous prime is 664280471. The next prime is 664280597. The reversal of 664280537 is 735082466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553378576 + 110901961 = 23524^2 + 10531^2 .

It is a cyclic number.

It is not a de Polignac number, because 664280537 - 2¹⁰ = 664279513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664280494 and 664280503.

It is not a weakly prime, because it can be changed into another prime (664280597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332140268 + 332140269.

It is an arithmetic number, because the mean of its divisors is an integer number (332140269).

Almost surely, 2^664280537 is an apocalyptic number.

It is an amenable number.

664280537 is a deficient number, since it is larger than the sum of its proper divisors (1).

664280537 is an equidigital number, since it uses as much as digits as its factorization.

664280537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 664280537 is about 25773.6403521117. The cubic root of 664280537 is about 872.5369806686.

The spelling of 664280537 in words is "six hundred sixty-four million, two hundred eighty thousand, five hundred thirty-seven".