61560403987 has 2 divisors, whose sum is σ = 61560403988. Its totient is φ = 61560403986.

The previous prime is 61560403939. The next prime is 61560404071. The reversal of 61560403987 is 78930406516.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61560403987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61560403987.

It is not a weakly prime, because it can be changed into another prime (61560413987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30780201993 + 30780201994.

It is an arithmetic number, because the mean of its divisors is an integer number (30780201994).

Almost surely, 2^61560403987 is an apocalyptic number.

61560403987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61560403987 is an equidigital number, since it uses as much as digits as its factorization.

61560403987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 61560403987 in words is "sixty-one billion, five hundred sixty million, four hundred three thousand, nine hundred eighty-seven".