1951776643613 has 2 divisors, whose sum is σ = 1951776643614. Its totient is φ = 1951776643612.

The previous prime is 1951776643573. The next prime is 1951776643637. The reversal of 1951776643613 is 3163466771591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1158460437124 + 793316206489 = 1076318^2 + 890683^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1951776643613 is a prime.

It is a super-2 number, since 2×1951776643613² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1951776643673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975888321806 + 975888321807.

It is an arithmetic number, because the mean of its divisors is an integer number (975888321807).

Almost surely, 2^{1951776643613} is an apocalyptic number.

It is an amenable number.

1951776643613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951776643613 is an equidigital number, since it uses as much as digits as its factorization.

1951776643613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 59.

The spelling of 1951776643613 in words is "one trillion, nine hundred fifty-one billion, seven hundred seventy-six million, six hundred forty-three thousand, six hundred thirteen".