61575551987 has 2 divisors, whose sum is σ = 61575551988. Its totient is φ = 61575551986.

The previous prime is 61575551923. The next prime is 61575552007. The reversal of 61575551987 is 78915557516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61575551987 - 2⁶ = 61575551923 is a prime.

It is not a weakly prime, because it can be changed into another prime (61575551087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30787775993 + 30787775994.

It is an arithmetic number, because the mean of its divisors is an integer number (30787775994).

Almost surely, 2^61575551987 is an apocalyptic number.

61575551987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61575551987 is an equidigital number, since it uses as much as digits as its factorization.

61575551987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13230000, while the sum is 59.

The spelling of 61575551987 in words is "sixty-one billion, five hundred seventy-five million, five hundred fifty-one thousand, nine hundred eighty-seven".