72056508215261 has 4 divisors (see below), whose sum is σ = 72729933525792. Its totient is φ = 71383082904732.

The previous prime is 72056508215239. The next prime is 72056508215267. The reversal of 72056508215261 is 16251280565027.

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 72056508215261 - 2¹⁰ = 72056508214237 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 (72056508215267) 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, 336712655105 + ... + 336712655318.

It is an arithmetic number, because the mean of its divisors is an integer number (18182483381448).

Almost surely, 2^{72056508215261} is an apocalyptic number.

It is an amenable number.

72056508215261 is a deficient number, since it is larger than the sum of its proper divisors (673425310531).

72056508215261 is a wasteful number, since it uses less digits than its factorization.

72056508215261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673425310530.

The product of its (nonzero) digits is 2016000, while the sum is 50.

The spelling of 72056508215261 in words is "seventy-two trillion, fifty-six billion, five hundred eight million, two hundred fifteen thousand, two hundred sixty-one".