215672340577 has 8 divisors (see below), whose sum is σ = 217203417000. Its totient is φ = 214142379264.

The previous prime is 215672340571. The next prime is 215672340581. The reversal of 215672340577 is 775043276512.

It can be written as a sum of positive squares in 4 ways, for example, as 562828176 + 215109512401 = 23724^2 + 463799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215672340577 is a prime.

It is a super-2 number, since 2×215672340577² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215672340577.

It is not an unprimeable number, because it can be changed into a prime (215672340571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111343 + ... + 666139.

It is an arithmetic number, because the mean of its divisors is an integer number (27150427125).

Almost surely, 2^215672340577 is an apocalyptic number.

It is an amenable number.

215672340577 is a deficient number, since it is larger than the sum of its proper divisors (1531076423).

215672340577 is a wasteful number, since it uses less digits than its factorization.

215672340577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557555.

The product of its (nonzero) digits is 2469600, while the sum is 49.

The spelling of 215672340577 in words is "two hundred fifteen billion, six hundred seventy-two million, three hundred forty thousand, five hundred seventy-seven".