61566851503 has 2 divisors, whose sum is σ = 61566851504. Its totient is φ = 61566851502.

The previous prime is 61566851501. The next prime is 61566851527. The reversal of 61566851503 is 30515866516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61566851503 - 2¹ = 61566851501 is a prime.

Together with 61566851501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61566851501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30783425751 + 30783425752.

It is an arithmetic number, because the mean of its divisors is an integer number (30783425752).

Almost surely, 2^61566851503 is an apocalyptic number.

61566851503 is a deficient number, since it is larger than the sum of its proper divisors (1).

61566851503 is an equidigital number, since it uses as much as digits as its factorization.

61566851503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 61566851503 in words is "sixty-one billion, five hundred sixty-six million, eight hundred fifty-one thousand, five hundred three".