61553755 has 16 divisors (see below), whose sum is σ = 78315264. Its totient is φ = 46362240.

The previous prime is 61553741. The next prime is 61553759. The reversal of 61553755 is 55735516.

It is not a de Polignac number, because 61553755 - 2⁷ = 61553627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61553759) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 369 + ... + 11101.

It is an arithmetic number, because the mean of its divisors is an integer number (4894704).

Almost surely, 2^61553755 is an apocalyptic number.

61553755 is a deficient number, since it is larger than the sum of its proper divisors (16761509).

61553755 is a wasteful number, since it uses less digits than its factorization.

61553755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806.

The product of its digits is 78750, while the sum is 37.

The square root of 61553755 is about 7845.6201157079. The cubic root of 61553755 is about 394.8373094899.

The spelling of 61553755 in words is "sixty-one million, five hundred fifty-three thousand, seven hundred fifty-five".