72162721455 has 64 divisors (see below), whose sum is σ = 127849052160. Its totient is φ = 34465305600.

The previous prime is 72162721429. The next prime is 72162721481. The reversal of 72162721455 is 55412726127.

It is an interprime number because it is at equal distance from previous prime (72162721429) and next prime (72162721481).

It is not a de Polignac number, because 72162721455 - 2⁷ = 72162721327 is a prime.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 3970569 + ... + 3988701.

It is an arithmetic number, because the mean of its divisors is an integer number (1997641440).

Almost surely, 2^72162721455 is an apocalyptic number.

72162721455 is a deficient number, since it is larger than the sum of its proper divisors (55686330705).

72162721455 is a wasteful number, since it uses less digits than its factorization.

72162721455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18512.

The product of its digits is 235200, while the sum is 42.

The spelling of 72162721455 in words is "seventy-two billion, one hundred sixty-two million, seven hundred twenty-one thousand, four hundred fifty-five".