667238797 has 16 divisors (see below), whose sum is σ = 743308272. Its totient is φ = 596090880.

The previous prime is 667238777. The next prime is 667238821. The reversal of 667238797 is 797832766.

It can be written as a sum of positive squares in 8 ways, for example, as 4639716 + 662599081 = 2154^2 + 25741^2 .

It is a cyclic number.

It is not a de Polignac number, because 667238797 - 2⁷ = 667238669 is a prime.

It is a super-2 number, since 2×667238797² = 890415224444014418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667238777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12853 + ... + 38725.

It is an arithmetic number, because the mean of its divisors is an integer number (46456767).

Almost surely, 2^667238797 is an apocalyptic number.

It is an amenable number.

667238797 is a deficient number, since it is larger than the sum of its proper divisors (76069475).

667238797 is a wasteful number, since it uses less digits than its factorization.

667238797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25968.

The product of its digits is 5334336, while the sum is 55.

The square root of 667238797 is about 25830.9658549579. The cubic root of 667238797 is about 873.8302942237.

The spelling of 667238797 in words is "six hundred sixty-seven million, two hundred thirty-eight thousand, seven hundred ninety-seven".