667661337 has 24 divisors (see below), whose sum is σ = 1131963456. Its totient is φ = 371208096.

The previous prime is 667661327. The next prime is 667661359. The reversal of 667661337 is 733166766.

It is not a de Polignac number, because 667661337 - 2¹⁴ = 667644953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667661292 and 667661301.

It is not an unprimeable number, because it can be changed into a prime (667661327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140883 + ... + 145544.

It is an arithmetic number, because the mean of its divisors is an integer number (47165144).

Almost surely, 2^667661337 is an apocalyptic number.

It is an amenable number.

667661337 is a deficient number, since it is larger than the sum of its proper divisors (464302119).

667661337 is a wasteful number, since it uses less digits than its factorization.

667661337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286477 (or 286474 counting only the distinct ones).

The product of its digits is 571536, while the sum is 45.

The square root of 667661337 is about 25839.1435036071. The cubic root of 667661337 is about 874.0147111279.

The spelling of 667661337 in words is "six hundred sixty-seven million, six hundred sixty-one thousand, three hundred thirty-seven".