61575552007 has 2 divisors, whose sum is σ = 61575552008. Its totient is φ = 61575552006.

The previous prime is 61575551987. The next prime is 61575552067. The reversal of 61575552007 is 70025557516.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61575552007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61575552067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30787776003 + 30787776004.

It is an arithmetic number, because the mean of its divisors is an integer number (30787776004).

Almost surely, 2^61575552007 is an apocalyptic number.

61575552007 is a deficient number, since it is larger than the sum of its proper divisors (1).

61575552007 is an equidigital number, since it uses as much as digits as its factorization.

61575552007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367500, while the sum is 43.

The spelling of 61575552007 in words is "sixty-one billion, five hundred seventy-five million, five hundred fifty-two thousand, seven".