1964991318253 has 2 divisors, whose sum is σ = 1964991318254. Its totient is φ = 1964991318252.

The previous prime is 1964991318179. The next prime is 1964991318359. The reversal of 1964991318253 is 3528131994691.

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., 1554465355524 + 410525962729 = 1246782^2 + 640723^2 .

It is an emirp because it is prime and its reverse (3528131994691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1964991318253 is a prime.

It is a super-2 number, since 2×1964991318253² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1964991318191 and 1964991318200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1964991312253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982495659126 + 982495659127.

It is an arithmetic number, because the mean of its divisors is an integer number (982495659127).

Almost surely, 2^{1964991318253} is an apocalyptic number.

It is an amenable number.

1964991318253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964991318253 is an equidigital number, since it uses as much as digits as its factorization.

1964991318253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 61.

The spelling of 1964991318253 in words is "one trillion, nine hundred sixty-four billion, nine hundred ninety-one million, three hundred eighteen thousand, two hundred fifty-three".