66315601 has 16 divisors (see below), whose sum is σ = 76745088. Its totient is φ = 56707200.

The previous prime is 66315583. The next prime is 66315607. The reversal of 66315601 is 10651366.

It is not a de Polignac number, because 66315601 - 2¹⁵ = 66282833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66315601.

It is not an unprimeable number, because it can be changed into a prime (66315607) 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, 13285 + ... + 17581.

It is an arithmetic number, because the mean of its divisors is an integer number (4796568).

Almost surely, 2^66315601 is an apocalyptic number.

66315601 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66315601 is a deficient number, since it is larger than the sum of its proper divisors (10429487).

66315601 is a wasteful number, since it uses less digits than its factorization.

66315601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 66315601 is about 8143.4391383493. The cubic root of 66315601 is about 404.7671292479.

Adding to 66315601 its reverse (10651366), we get a palindrome (76966967).

The spelling of 66315601 in words is "sixty-six million, three hundred fifteen thousand, six hundred one".