215465991101 has 2 divisors, whose sum is σ = 215465991102. Its totient is φ = 215465991100.

The previous prime is 215465991079. The next prime is 215465991113. The reversal of 215465991101 is 101199564512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215434294201 + 31696900 = 464149^2 + 5630^2 .

It is a cyclic number.

It is not a de Polignac number, because 215465991101 - 2¹⁸ = 215465728957 is a prime.

It is a super-2 number, since 2×215465991101² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215465991001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107732995550 + 107732995551.

It is an arithmetic number, because the mean of its divisors is an integer number (107732995551).

Almost surely, 2^215465991101 is an apocalyptic number.

It is an amenable number.

215465991101 is a deficient number, since it is larger than the sum of its proper divisors (1).

215465991101 is an equidigital number, since it uses as much as digits as its factorization.

215465991101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 44.

The spelling of 215465991101 in words is "two hundred fifteen billion, four hundred sixty-five million, nine hundred ninety-one thousand, one hundred one".