66535854 has 64 divisors (see below), whose sum is σ = 168099840. Its totient is φ = 17053920.

The previous prime is 66535823. The next prime is 66535873. The reversal of 66535854 is 45853566.

It is a happy number.

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 polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35587 + ... + 37409.

It is an arithmetic number, because the mean of its divisors is an integer number (2626560).

Almost surely, 2^66535854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66535854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84049920).

66535854 is an abundant number, since it is smaller than the sum of its proper divisors (101563986).

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

66535854 is a wasteful number, since it uses less digits than its factorization.

66535854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925.

The product of its digits is 432000, while the sum is 42.

The square root of 66535854 is about 8156.9512687033. The cubic root of 66535854 is about 405.2147496975.

The spelling of 66535854 in words is "sixty-six million, five hundred thirty-five thousand, eight hundred fifty-four".