215440245722747 has 4 divisors (see below), whose sum is σ = 215638442822016. Its totient is φ = 215242048623480.

The previous prime is 215440245722717. The next prime is 215440245722771. The reversal of 215440245722747 is 747227542044512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215440245722747 - 2³⁴ = 215423065853563 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215440245722692 and 215440245722701.

It is not an unprimeable number, because it can be changed into a prime (215440245722717) 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, 99098548004 + ... + 99098550177.

It is an arithmetic number, because the mean of its divisors is an integer number (53909610705504).

Almost surely, 2^{215440245722747} is an apocalyptic number.

215440245722747 is a deficient number, since it is larger than the sum of its proper divisors (198197099269).

215440245722747 is a wasteful number, since it uses less digits than its factorization.

215440245722747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198197099268.

The product of its (nonzero) digits is 35123200, while the sum is 56.

The spelling of 215440245722747 in words is "two hundred fifteen trillion, four hundred forty billion, two hundred forty-five million, seven hundred twenty-two thousand, seven hundred forty-seven".