66123451 has 8 divisors (see below), whose sum is σ = 69526800. Its totient is φ = 62795040.

The previous prime is 66123443. The next prime is 66123479. The reversal of 66123451 is 15432166.

66123451 = 1011² + 1012² + ... + 1071².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66123451 - 2³ = 66123443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66126451) 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, 16921 + ... + 20458.

It is an arithmetic number, because the mean of its divisors is an integer number (8690850).

Almost surely, 2^66123451 is an apocalyptic number.

66123451 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66123451 is a deficient number, since it is larger than the sum of its proper divisors (3403349).

66123451 is a wasteful number, since it uses less digits than its factorization.

66123451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37469.

The product of its digits is 4320, while the sum is 28.

The square root of 66123451 is about 8131.6327388785. The cubic root of 66123451 is about 404.3758123595.

The spelling of 66123451 in words is "sixty-six million, one hundred twenty-three thousand, four hundred fifty-one".