667332691551 has 32 divisors (see below), whose sum is σ = 1013183216640. Its totient is φ = 433853668800.

The previous prime is 667332691513. The next prime is 667332691559. The reversal of 667332691551 is 155196233766.

667332691551 is a `hidden beast` number, since 6 + 67 + 3 + 3 + 26 + 9 + 1 + 551 = 666.

It is not a de Polignac number, because 667332691551 - 2¹⁰ = 667332690527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667332691559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2511496 + ... + 2764466.

It is an arithmetic number, because the mean of its divisors is an integer number (31661975520).

Almost surely, 2^667332691551 is an apocalyptic number.

667332691551 is a deficient number, since it is larger than the sum of its proper divisors (345850525089).

667332691551 is a wasteful number, since it uses less digits than its factorization.

667332691551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255404 (or 255398 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 54.

The spelling of 667332691551 in words is "six hundred sixty-seven billion, three hundred thirty-two million, six hundred ninety-one thousand, five hundred fifty-one".