1316621551403 has 2 divisors, whose sum is σ = 1316621551404. Its totient is φ = 1316621551402.

The previous prime is 1316621551397. The next prime is 1316621551409. The reversal of 1316621551403 is 3041551266131.

It is a balanced prime because it is at equal distance from previous prime (1316621551397) and next prime (1316621551409).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1316621551403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1316621551409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658310775701 + 658310775702.

It is an arithmetic number, because the mean of its divisors is an integer number (658310775702).

Almost surely, 2^{1316621551403} is an apocalyptic number.

1316621551403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316621551403 is an equidigital number, since it uses as much as digits as its factorization.

1316621551403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 1316621551403 in words is "one trillion, three hundred sixteen billion, six hundred twenty-one million, five hundred fifty-one thousand, four hundred three".