61557375 has 32 divisors (see below), whose sum is σ = 111750912. Its totient is φ = 29844000.

The previous prime is 61557341. The next prime is 61557383. The reversal of 61557375 is 57375516.

It is a happy number.

It is not a de Polignac number, because 61557375 - 2⁷ = 61557247 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3337 + ... + 11586.

It is an arithmetic number, because the mean of its divisors is an integer number (3492216).

Almost surely, 2^61557375 is an apocalyptic number.

61557375 is a deficient number, since it is larger than the sum of its proper divisors (50193537).

61557375 is a wasteful number, since it uses less digits than its factorization.

61557375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14952 (or 14942 counting only the distinct ones).

The product of its digits is 110250, while the sum is 39.

The square root of 61557375 is about 7845.8508142839. The cubic root of 61557375 is about 394.8450495162.

It can be divided in two parts, 6155 and 7375, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 61557375 in words is "sixty-one million, five hundred fifty-seven thousand, three hundred seventy-five".