61525555 has 16 divisors (see below), whose sum is σ = 90869184. Its totient is φ = 38943360.

The previous prime is 61525537. The next prime is 61525589. The reversal of 61525555 is 55552516.

It is not a de Polignac number, because 61525555 - 2⁵ = 61525523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61525555.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67156 + ... + 68065.

It is an arithmetic number, because the mean of its divisors is an integer number (5679324).

Almost surely, 2^61525555 is an apocalyptic number.

61525555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61525555 is a deficient number, since it is larger than the sum of its proper divisors (29343629).

61525555 is a wasteful number, since it uses less digits than its factorization.

61525555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135246.

The product of its digits is 37500, while the sum is 34.

The square root of 61525555 is about 7843.8227287465. The cubic root of 61525555 is about 394.7770038653. Note that the first 3 decimals are identical.

The spelling of 61525555 in words is "sixty-one million, five hundred twenty-five thousand, five hundred fifty-five".