61655603 has 2 divisors, whose sum is σ = 61655604. Its totient is φ = 61655602.

The previous prime is 61655597. The next prime is 61655623. The reversal of 61655603 is 30655616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61655603 - 2²⁴ = 44878387 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61655603.

It is not a weakly prime, because it can be changed into another prime (61655623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30827801 + 30827802.

It is an arithmetic number, because the mean of its divisors is an integer number (30827802).

Almost surely, 2^61655603 is an apocalyptic number.

61655603 is a deficient number, since it is larger than the sum of its proper divisors (1).

61655603 is an equidigital number, since it uses as much as digits as its factorization.

61655603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 61655603 is about 7852.1081882511. The cubic root of 61655603 is about 395.0549579035.

The spelling of 61655603 in words is "sixty-one million, six hundred fifty-five thousand, six hundred three".