215275751797 has 4 divisors (see below), whose sum is σ = 215288483616. Its totient is φ = 215263019980.

The previous prime is 215275751777. The next prime is 215275751827. The reversal of 215275751797 is 797157572512.

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 a de Polignac number, because none of the positive numbers 2^k-215275751797 is a prime.

It is a super-3 number, since 3×215275751797³ (a number of 35 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215275751777) 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, 6340513 + ... + 6374374.

It is an arithmetic number, because the mean of its divisors is an integer number (53822120904).

Almost surely, 2^215275751797 is an apocalyptic number.

It is an amenable number.

215275751797 is a deficient number, since it is larger than the sum of its proper divisors (12731819).

215275751797 is a wasteful number, since it uses less digits than its factorization.

215275751797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12731818.

The product of its digits is 10804500, while the sum is 58.

The spelling of 215275751797 in words is "two hundred fifteen billion, two hundred seventy-five million, seven hundred fifty-one thousand, seven hundred ninety-seven".