1531864646401 has 2 divisors, whose sum is σ = 1531864646402. Its totient is φ = 1531864646400.

The previous prime is 1531864646393. The next prime is 1531864646423. The reversal of 1531864646401 is 1046464681351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1530542596801 + 1322049600 = 1237151^2 + 36360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531864646401 - 2³ = 1531864646393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531864646701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765932323200 + 765932323201.

It is an arithmetic number, because the mean of its divisors is an integer number (765932323201).

Almost surely, 2^{1531864646401} is an apocalyptic number.

It is an amenable number.

1531864646401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531864646401 is an equidigital number, since it uses as much as digits as its factorization.

1531864646401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 1531864646401 in words is "one trillion, five hundred thirty-one billion, eight hundred sixty-four million, six hundred forty-six thousand, four hundred one".