61218070553 has 2 divisors, whose sum is σ = 61218070554. Its totient is φ = 61218070552.

The previous prime is 61218070523. The next prime is 61218070561. The reversal of 61218070553 is 35507081216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42177658384 + 19040412169 = 205372^2 + 137987^2 .

It is a cyclic number.

It is not a de Polignac number, because 61218070553 - 2⁶ = 61218070489 is a prime.

It is not a weakly prime, because it can be changed into another prime (61218070523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30609035276 + 30609035277.

It is an arithmetic number, because the mean of its divisors is an integer number (30609035277).

Almost surely, 2^61218070553 is an apocalyptic number.

It is an amenable number.

61218070553 is a deficient number, since it is larger than the sum of its proper divisors (1).

61218070553 is an equidigital number, since it uses as much as digits as its factorization.

61218070553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 61218070553 in words is "sixty-one billion, two hundred eighteen million, seventy thousand, five hundred fifty-three".