72555226421 has 4 divisors (see below), whose sum is σ = 74242557312. Its totient is φ = 70867895532.

The previous prime is 72555226399. The next prime is 72555226423. The reversal of 72555226421 is 12462255527.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72555226421 - 2¹⁸ = 72554964277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72555226423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 843665381 + ... + 843665466.

It is an arithmetic number, because the mean of its divisors is an integer number (18560639328).

Almost surely, 2^72555226421 is an apocalyptic number.

It is an amenable number.

72555226421 is a deficient number, since it is larger than the sum of its proper divisors (1687330891).

72555226421 is a wasteful number, since it uses less digits than its factorization.

72555226421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687330890.

The product of its digits is 336000, while the sum is 41.

The spelling of 72555226421 in words is "seventy-two billion, five hundred fifty-five million, two hundred twenty-six thousand, four hundred twenty-one".