61087760813 has 2 divisors, whose sum is σ = 61087760814. Its totient is φ = 61087760812.

The previous prime is 61087760809. The next prime is 61087760837. The reversal of 61087760813 is 31806778016.

61087760813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31907605129 + 29180155684 = 178627^2 + 170822^2 .

It is a cyclic number.

It is not a de Polignac number, because 61087760813 - 2² = 61087760809 is a prime.

It is a super-2 number, since 2×61087760813² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61087760863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30543880406 + 30543880407.

It is an arithmetic number, because the mean of its divisors is an integer number (30543880407).

Almost surely, 2^61087760813 is an apocalyptic number.

It is an amenable number.

61087760813 is a deficient number, since it is larger than the sum of its proper divisors (1).

61087760813 is an equidigital number, since it uses as much as digits as its factorization.

61087760813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 61087760813 in words is "sixty-one billion, eighty-seven million, seven hundred sixty thousand, eight hundred thirteen".