1963137667081 has 4 divisors (see below), whose sum is σ = 1963186260372. Its totient is φ = 1963089073792.

The previous prime is 1963137667069. The next prime is 1963137667121. The reversal of 1963137667081 is 1807667313691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 306150849481 + 1656986817600 = 553309^2 + 1287240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1963137667081 is a prime.

It is a super-2 number, since 2×1963137667081² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1963137667021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24235996 + ... + 24316861.

It is an arithmetic number, because the mean of its divisors is an integer number (490796565093).

Almost surely, 2^{1963137667081} is an apocalyptic number.

It is an amenable number.

1963137667081 is a deficient number, since it is larger than the sum of its proper divisors (48593291).

1963137667081 is an equidigital number, since it uses as much as digits as its factorization.

1963137667081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48593290.

The product of its (nonzero) digits is 6858432, while the sum is 58.

The spelling of 1963137667081 in words is "one trillion, nine hundred sixty-three billion, one hundred thirty-seven million, six hundred sixty-seven thousand, eighty-one".