71221655455 has 4 divisors (see below), whose sum is σ = 85465986552. Its totient is φ = 56977324360.

The previous prime is 71221655389. The next prime is 71221655471. The reversal of 71221655455 is 55455612217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55455612217 = 61 ⋅909108397.

It is not a de Polignac number, because 71221655455 - 2⁹ = 71221654943 is a prime.

It is a super-3 number, since 3×71221655455³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7122165541 + ... + 7122165550.

It is an arithmetic number, because the mean of its divisors is an integer number (21366496638).

Almost surely, 2^71221655455 is an apocalyptic number.

71221655455 is a deficient number, since it is larger than the sum of its proper divisors (14244331097).

71221655455 is a wasteful number, since it uses less digits than its factorization.

71221655455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14244331096.

The product of its digits is 420000, while the sum is 43.

The spelling of 71221655455 in words is "seventy-one billion, two hundred twenty-one million, six hundred fifty-five thousand, four hundred fifty-five".