66351501 has 16 divisors (see below), whose sum is σ = 101470720. Its totient is φ = 42806880.

The previous prime is 66351499. The next prime is 66351503. The reversal of 66351501 is 10515366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66351499) and next prime (66351503).

It is not a de Polignac number, because 66351501 - 2¹ = 66351499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66351503) 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, 38800 + ... + 40473.

It is an arithmetic number, because the mean of its divisors is an integer number (6341920).

Almost surely, 2^66351501 is an apocalyptic number.

It is an amenable number.

66351501 is a deficient number, since it is larger than the sum of its proper divisors (35119219).

66351501 is a wasteful number, since it uses less digits than its factorization.

66351501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79313 (or 79307 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 66351501 is about 8145.6430685367. The cubic root of 66351501 is about 404.8401564007.

Adding to 66351501 its reverse (10515366), we get a palindrome (76866867).

The spelling of 66351501 in words is "sixty-six million, three hundred fifty-one thousand, five hundred one".