65993550 has 48 divisors (see below), whose sum is σ = 187047552. Its totient is φ = 15084000.

The previous prime is 65993539. The next prime is 65993561. The reversal of 65993550 is 5539956.

It is an interprime number because it is at equal distance from previous prime (65993539) and next prime (65993561).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30376 + ... + 32475.

It is an arithmetic number, because the mean of its divisors is an integer number (3896824).

Almost surely, 2^65993550 is an apocalyptic number.

65993550 is an abundant number, since it is smaller than the sum of its proper divisors (121054002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65993550 is a wasteful number, since it uses less digits than its factorization.

65993550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62873 (or 62868 counting only the distinct ones).

The product of its (nonzero) digits is 182250, while the sum is 42.

The square root of 65993550 is about 8123.6414248784. The cubic root of 65993550 is about 404.1108369878.

The spelling of 65993550 in words is "sixty-five million, nine hundred ninety-three thousand, five hundred fifty".