667201562781 has 16 divisors (see below), whose sum is σ = 958769468160. Its totient is φ = 410269953600.

The previous prime is 667201562771. The next prime is 667201562803. The reversal of 667201562781 is 187265102766.

It is not a de Polignac number, because 667201562781 - 2¹¹ = 667201560733 is a prime.

It is a super-2 number, since 2×667201562781² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667201562771) 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, 6524101 + ... + 6625578.

It is an arithmetic number, because the mean of its divisors is an integer number (59923091760).

Almost surely, 2^667201562781 is an apocalyptic number.

It is an amenable number.

667201562781 is a deficient number, since it is larger than the sum of its proper divisors (291567905379).

667201562781 is a wasteful number, since it uses less digits than its factorization.

667201562781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13150996.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 667201562781 in words is "six hundred sixty-seven billion, two hundred one million, five hundred sixty-two thousand, seven hundred eighty-one".