1640805154601 has 2 divisors, whose sum is σ = 1640805154602. Its totient is φ = 1640805154600.

The previous prime is 1640805154553. The next prime is 1640805154609. The reversal of 1640805154601 is 1064515080461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1478714368576 + 162090786025 = 1216024^2 + 402605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640805154601 is a prime.

It is a super-2 number, since 2×1640805154601² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1640805154609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820402577300 + 820402577301.

It is an arithmetic number, because the mean of its divisors is an integer number (820402577301).

Almost surely, 2^{1640805154601} is an apocalyptic number.

It is an amenable number.

1640805154601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640805154601 is an equidigital number, since it uses as much as digits as its factorization.

1640805154601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 1640805154601 in words is "one trillion, six hundred forty billion, eight hundred five million, one hundred fifty-four thousand, six hundred one".