61512987953 has 2 divisors, whose sum is σ = 61512987954. Its totient is φ = 61512987952.

The previous prime is 61512987869. The next prime is 61512987967. The reversal of 61512987953 is 35978921516.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61230512704 + 282475249 = 247448^2 + 16807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61512987953 is a prime.

It is not a weakly prime, because it can be changed into another prime (61512987853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30756493976 + 30756493977.

It is an arithmetic number, because the mean of its divisors is an integer number (30756493977).

Almost surely, 2^61512987953 is an apocalyptic number.

It is an amenable number.

61512987953 is a deficient number, since it is larger than the sum of its proper divisors (1).

61512987953 is an equidigital number, since it uses as much as digits as its factorization.

61512987953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 56.

The spelling of 61512987953 in words is "sixty-one billion, five hundred twelve million, nine hundred eighty-seven thousand, nine hundred fifty-three".