667231215642 has 32 divisors (see below), whose sum is σ = 1547202821760. Its totient is φ = 212740387200.

The previous prime is 667231215617. The next prime is 667231215643. The reversal of 667231215642 is 246512132766.

667231215642 is a `hidden beast` number, since 6 + 6 + 72 + 3 + 12 + 1 + 564 + 2 = 666.

It is a super-2 number, since 2×667231215642² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667231215643) 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, 268610359 + ... + 268612842.

It is an arithmetic number, because the mean of its divisors is an integer number (48350088180).

Almost surely, 2^667231215642 is an apocalyptic number.

667231215642 is an abundant number, since it is smaller than the sum of its proper divisors (879971606118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667231215642 is a wasteful number, since it uses less digits than its factorization.

667231215642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537223235 (or 537223229 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 667231215642 in words is "six hundred sixty-seven billion, two hundred thirty-one million, two hundred fifteen thousand, six hundred forty-two".