66221643015101 has 12 divisors (see below), whose sum is σ = 77063209441920. Its totient is φ = 56739399113880.

The previous prime is 66221643015089. The next prime is 66221643015103. The reversal of 66221643015101 is 10151034612266.

It is not a de Polignac number, because 66221643015101 - 2⁴² = 61823596503997 is a prime.

It is a super-2 number, since 2×66221643015101² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221643015103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261886445 + ... + 262139186.

It is an arithmetic number, because the mean of its divisors is an integer number (6421934120160).

Almost surely, 2^{66221643015101} is an apocalyptic number.

It is an amenable number.

66221643015101 is a deficient number, since it is larger than the sum of its proper divisors (10841566426819).

66221643015101 is a wasteful number, since it uses less digits than its factorization.

66221643015101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524028224 (or 524028217 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

Adding to 66221643015101 its reverse (10151034612266), we get a palindrome (76372677627367).

The spelling of 66221643015101 in words is "sixty-six trillion, two hundred twenty-one billion, six hundred forty-three million, fifteen thousand, one hundred one".