66111954 has 16 divisors (see below), whose sum is σ = 132627360. Its totient is φ = 21970080.

The previous prime is 66111949. The next prime is 66111973. The reversal of 66111954 is 45911166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14659 + ... + 18630.

It is an arithmetic number, because the mean of its divisors is an integer number (8289210).

Almost surely, 2^66111954 is an apocalyptic number.

66111954 is an abundant number, since it is smaller than the sum of its proper divisors (66515406).

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

66111954 is a wasteful number, since it uses less digits than its factorization.

66111954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33625.

The product of its digits is 6480, while the sum is 33.

The square root of 66111954 is about 8130.9257775483. The cubic root of 66111954 is about 404.3523744913.

The spelling of 66111954 in words is "sixty-six million, one hundred eleven thousand, nine hundred fifty-four".