66552554 has 16 divisors (see below), whose sum is σ = 106354080. Its totient is φ = 31143600.

The previous prime is 66552539. The next prime is 66552557. The reversal of 66552554 is 45525566.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (66552557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7397 + ... + 13704.

It is an arithmetic number, because the mean of its divisors is an integer number (6647130).

Almost surely, 2^66552554 is an apocalyptic number.

66552554 is a deficient number, since it is larger than the sum of its proper divisors (39801526).

66552554 is a wasteful number, since it uses less digits than its factorization.

66552554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21205.

The product of its digits is 180000, while the sum is 38.

The square root of 66552554 is about 8157.9748712533. The cubic root of 66552554 is about 405.2486488152.

The spelling of 66552554 in words is "sixty-six million, five hundred fifty-two thousand, five hundred fifty-four".