61509755 has 8 divisors (see below), whose sum is σ = 73870272. Its totient is φ = 49168768.

The previous prime is 61509743. The next prime is 61509761. The reversal of 61509755 is 55790516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61509755 - 2⁴ = 61509739 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3299 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (9233784).

Almost surely, 2^61509755 is an apocalyptic number.

61509755 is a deficient number, since it is larger than the sum of its proper divisors (12360517).

61509755 is a wasteful number, since it uses less digits than its factorization.

61509755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9765.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 61509755 is about 7842.8155021013. The cubic root of 61509755 is about 394.7432075527.

The spelling of 61509755 in words is "sixty-one million, five hundred nine thousand, seven hundred fifty-five".