66121254 has 24 divisors (see below), whose sum is σ = 150803640. Its totient is φ = 20880288.

The previous prime is 66121249. The next prime is 66121261. The reversal of 66121254 is 45212166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96327 + ... + 97010.

It is an arithmetic number, because the mean of its divisors is an integer number (6283485).

Almost surely, 2^66121254 is an apocalyptic number.

66121254 is an abundant number, since it is smaller than the sum of its proper divisors (84682386).

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

66121254 is a wasteful number, since it uses less digits than its factorization.

66121254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193364 (or 193361 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 66121254 is about 8131.4976480351. The cubic root of 66121254 is about 404.3713337492.

The spelling of 66121254 in words is "sixty-six million, one hundred twenty-one thousand, two hundred fifty-four".