215862460691 has 2 divisors, whose sum is σ = 215862460692. Its totient is φ = 215862460690.

The previous prime is 215862460687. The next prime is 215862460727. The reversal of 215862460691 is 196064268512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215862460691 - 2² = 215862460687 is a prime.

It is not a weakly prime, because it can be changed into another prime (215862460391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107931230345 + 107931230346.

It is an arithmetic number, because the mean of its divisors is an integer number (107931230346).

Almost surely, 2^215862460691 is an apocalyptic number.

215862460691 is a deficient number, since it is larger than the sum of its proper divisors (1).

215862460691 is an equidigital number, since it uses as much as digits as its factorization.

215862460691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 215862460691 in words is "two hundred fifteen billion, eight hundred sixty-two million, four hundred sixty thousand, six hundred ninety-one".