61555425 has 24 divisors (see below), whose sum is σ = 103174944. Its totient is φ = 32376960.

The previous prime is 61555423. The next prime is 61555427. The reversal of 61555425 is 52455516.

61555425 = 407² + 408² + ... + 631².

61555425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61555423) and next prime (61555427).

It is not a de Polignac number, because 61555425 - 2¹ = 61555423 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61555423) 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 in 23 ways as a sum of consecutive naturals, for example, 147 + ... + 11096.

It is an arithmetic number, because the mean of its divisors is an integer number (4298956).

Almost surely, 2^61555425 is an apocalyptic number.

It is an amenable number.

61555425 is a deficient number, since it is larger than the sum of its proper divisors (41619519).

61555425 is a wasteful number, since it uses less digits than its factorization.

61555425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11329 (or 11324 counting only the distinct ones).

The product of its digits is 30000, while the sum is 33.

The square root of 61555425 is about 7845.7265437944. The cubic root of 61555425 is about 394.8408802027.

Subtracting from 61555425 its reverse (52455516), we obtain a palindrome (9099909).

The spelling of 61555425 in words is "sixty-one million, five hundred fifty-five thousand, four hundred twenty-five".