61553563 has 2 divisors, whose sum is σ = 61553564. Its totient is φ = 61553562.

The previous prime is 61553551. The next prime is 61553567. The reversal of 61553563 is 36535516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61553563 - 2¹³ = 61545371 is a prime.

It is a super-2 number, since 2×61553563² = 7577682235989938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61553567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30776781 + 30776782.

It is an arithmetic number, because the mean of its divisors is an integer number (30776782).

Almost surely, 2^61553563 is an apocalyptic number.

61553563 is a deficient number, since it is larger than the sum of its proper divisors (1).

61553563 is an equidigital number, since it uses as much as digits as its factorization.

61553563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 34.

The square root of 61553563 is about 7845.6078795719. The cubic root of 61553563 is about 394.8368989607.

The spelling of 61553563 in words is "sixty-one million, five hundred fifty-three thousand, five hundred sixty-three".