1625434701281 has 2 divisors, whose sum is σ = 1625434701282. Its totient is φ = 1625434701280.

The previous prime is 1625434701263. The next prime is 1625434701383. The reversal of 1625434701281 is 1821074345261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1323604230400 + 301830470881 = 1150480^2 + 549391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625434701281 - 2²² = 1625430506977 is a prime.

It is a super-2 number, since 2×1625434701281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1625434701481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812717350640 + 812717350641.

It is an arithmetic number, because the mean of its divisors is an integer number (812717350641).

Almost surely, 2^{1625434701281} is an apocalyptic number.

It is an amenable number.

1625434701281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625434701281 is an equidigital number, since it uses as much as digits as its factorization.

1625434701281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 1625434701281 in words is "one trillion, six hundred twenty-five billion, four hundred thirty-four million, seven hundred one thousand, two hundred eighty-one".