1646312740091 has 2 divisors, whose sum is σ = 1646312740092. Its totient is φ = 1646312740090.

The previous prime is 1646312740057. The next prime is 1646312740139. The reversal of 1646312740091 is 1900472136461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1646312740091 - 2²² = 1646308545787 is a prime.

It is not a weakly prime, because it can be changed into another prime (1646312740001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823156370045 + 823156370046.

It is an arithmetic number, because the mean of its divisors is an integer number (823156370046).

Almost surely, 2^{1646312740091} is an apocalyptic number.

1646312740091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646312740091 is an equidigital number, since it uses as much as digits as its factorization.

1646312740091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 1646312740091 in words is "one trillion, six hundred forty-six billion, three hundred twelve million, seven hundred forty thousand, ninety-one".