215671147652766 has 16 divisors (see below), whose sum is σ = 464522471867664. Its totient is φ = 66360353123904.

The previous prime is 215671147652687. The next prime is 215671147652767. The reversal of 215671147652766 is 667256741176512.

It is a happy number.

It is a super-2 number, since 2×215671147652766² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215671147652697 and 215671147652706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215671147652767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1382507356671 + ... + 1382507356826.

It is an arithmetic number, because the mean of its divisors is an integer number (29032654491729).

Almost surely, 2^{215671147652766} is an apocalyptic number.

215671147652766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

215671147652766 is an abundant number, since it is smaller than the sum of its proper divisors (248851324214898).

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

215671147652766 is a wasteful number, since it uses less digits than its factorization.

215671147652766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2765014713515.

The product of its digits is 177811200, while the sum is 66.

The spelling of 215671147652766 in words is "two hundred fifteen trillion, six hundred seventy-one billion, one hundred forty-seven million, six hundred fifty-two thousand, seven hundred sixty-six".