66251023 has 16 divisors (see below), whose sum is σ = 71850240. Its totient is φ = 60860800.

The previous prime is 66251021. The next prime is 66251069. The reversal of 66251023 is 32015266.

It is a cyclic number.

It is not a de Polignac number, because 66251023 - 2¹ = 66251021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66251021) 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, 157908 + ... + 158326.

It is an arithmetic number, because the mean of its divisors is an integer number (4490640).

Almost surely, 2^66251023 is an apocalyptic number.

66251023 is a deficient number, since it is larger than the sum of its proper divisors (5599217).

66251023 is a wasteful number, since it uses less digits than its factorization.

66251023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 66251023 is about 8139.4731401977. The cubic root of 66251023 is about 404.6356994355.

Adding to 66251023 its reverse (32015266), we get a palindrome (98266289).

The spelling of 66251023 in words is "sixty-six million, two hundred fifty-one thousand, twenty-three".