72105421455 has 16 divisors (see below), whose sum is σ = 128187416160. Its totient is φ = 38456224704.

The previous prime is 72105421417. The next prime is 72105421463. The reversal of 72105421455 is 55412450127.

72105421455 is a `hidden beast` number, since 72 + 1 + 0 + 542 + 1 + 45 + 5 = 666.

It is not a de Polignac number, because 72105421455 - 2⁶ = 72105421391 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267056982 + ... + 267057251.

It is an arithmetic number, because the mean of its divisors is an integer number (8011713510).

Almost surely, 2^72105421455 is an apocalyptic number.

72105421455 is a deficient number, since it is larger than the sum of its proper divisors (56081994705).

72105421455 is a wasteful number, since it uses less digits than its factorization.

72105421455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534114247 (or 534114241 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The spelling of 72105421455 in words is "seventy-two billion, one hundred five million, four hundred twenty-one thousand, four hundred fifty-five".