66154992 has 80 divisors (see below), whose sum is σ = 184178688. Its totient is φ = 20401920.

The previous prime is 66154981. The next prime is 66154993. The reversal of 66154992 is 29945166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66154993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33258 + ... + 35190.

Almost surely, 2^66154992 is an apocalyptic number.

66154992 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66154992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92089344).

66154992 is an abundant number, since it is smaller than the sum of its proper divisors (118023696).

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

66154992 is a wasteful number, since it uses less digits than its factorization.

66154992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998 (or 1992 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 66154992 is about 8133.5719090692. The cubic root of 66154992 is about 404.4400981254.

The spelling of 66154992 in words is "sixty-six million, one hundred fifty-four thousand, nine hundred ninety-two".