215804137461 has 16 divisors (see below), whose sum is σ = 313905184320. Its totient is φ = 130786945920.

The previous prime is 215804137457. The next prime is 215804137489. The reversal of 215804137461 is 164731408512.

It is not a de Polignac number, because 215804137461 - 2² = 215804137457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215804130461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1813875 + ... + 1929183.

It is an arithmetic number, because the mean of its divisors is an integer number (19619074020).

Almost surely, 2^215804137461 is an apocalyptic number.

It is an amenable number.

215804137461 is a deficient number, since it is larger than the sum of its proper divisors (98101046859).

215804137461 is a wasteful number, since it uses less digits than its factorization.

215804137461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172036.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 215804137461 in words is "two hundred fifteen billion, eight hundred four million, one hundred thirty-seven thousand, four hundred sixty-one".