513670477861 has 2 divisors, whose sum is σ = 513670477862. Its totient is φ = 513670477860.

The previous prime is 513670477823. The next prime is 513670477891. The reversal of 513670477861 is 168774076315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 460681200225 + 52989277636 = 678735^2 + 230194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513670477861 is a prime.

It is a super-2 number, since 2×513670477861² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (513670477891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256835238930 + 256835238931.

It is an arithmetic number, because the mean of its divisors is an integer number (256835238931).

Almost surely, 2^513670477861 is an apocalyptic number.

It is an amenable number.

513670477861 is a deficient number, since it is larger than the sum of its proper divisors (1).

513670477861 is an equidigital number, since it uses as much as digits as its factorization.

513670477861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 513670477861 in words is "five hundred thirteen billion, six hundred seventy million, four hundred seventy-seven thousand, eight hundred sixty-one".