61512987853 has 2 divisors, whose sum is σ = 61512987854. Its totient is φ = 61512987852.

The previous prime is 61512987839. The next prime is 61512987869. The reversal of 61512987853 is 35878921516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56690657604 + 4822330249 = 238098^2 + 69443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61512987853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61512987794 and 61512987803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61512987803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30756493926 + 30756493927.

It is an arithmetic number, because the mean of its divisors is an integer number (30756493927).

Almost surely, 2^61512987853 is an apocalyptic number.

It is an amenable number.

61512987853 is a deficient number, since it is larger than the sum of its proper divisors (1).

61512987853 is an equidigital number, since it uses as much as digits as its factorization.

61512987853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 55.

The spelling of 61512987853 in words is "sixty-one billion, five hundred twelve million, nine hundred eighty-seven thousand, eight hundred fifty-three".