666376537 has 2 divisors, whose sum is σ = 666376538. Its totient is φ = 666376536.

The previous prime is 666376519. The next prime is 666376559. The reversal of 666376537 is 735673666.

666376537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608904976 + 57471561 = 24676^2 + 7581^2 .

It is a cyclic number.

It is not a de Polignac number, because 666376537 - 2⁷ = 666376409 is a prime.

It is a super-2 number, since 2×666376537² = 888115378128224738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666376507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333188268 + 333188269.

It is an arithmetic number, because the mean of its divisors is an integer number (333188269).

Almost surely, 2^666376537 is an apocalyptic number.

It is an amenable number.

666376537 is a deficient number, since it is larger than the sum of its proper divisors (1).

666376537 is an equidigital number, since it uses as much as digits as its factorization.

666376537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 49.

The square root of 666376537 is about 25814.2700264795. The cubic root of 666376537 is about 873.4537205439.

The spelling of 666376537 in words is "six hundred sixty-six million, three hundred seventy-six thousand, five hundred thirty-seven".