1954317005257 has 2 divisors, whose sum is σ = 1954317005258. Its totient is φ = 1954317005256.

The previous prime is 1954317005191. The next prime is 1954317005353. The reversal of 1954317005257 is 7525007134591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310541854521 + 643775150736 = 1144789^2 + 802356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1954317005257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1954317005257.

It is not a weakly prime, because it can be changed into another prime (1954317009257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977158502628 + 977158502629.

It is an arithmetic number, because the mean of its divisors is an integer number (977158502629).

Almost surely, 2^{1954317005257} is an apocalyptic number.

It is an amenable number.

1954317005257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954317005257 is an equidigital number, since it uses as much as digits as its factorization.

1954317005257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323000, while the sum is 49.

The spelling of 1954317005257 in words is "one trillion, nine hundred fifty-four billion, three hundred seventeen million, five thousand, two hundred fifty-seven".