66156037 has 8 divisors (see below), whose sum is σ = 68648216. Its totient is φ = 63700992.

The previous prime is 66156029. The next prime is 66156071. The reversal of 66156037 is 73065166.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22714756 + 43441281 = 4766^2 + 6591^2 .

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

It is a 9-Lehmer number, since φ(66156037) divides (66156037-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 66156037 - 2³ = 66156029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66155993 and 66156011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156017) 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, 5628 + ... + 12805.

It is an arithmetic number, because the mean of its divisors is an integer number (8581027).

Almost surely, 2^66156037 is an apocalyptic number.

It is an amenable number.

66156037 is a deficient number, since it is larger than the sum of its proper divisors (2492179).

66156037 is a wasteful number, since it uses less digits than its factorization.

66156037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18567.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66156037 is about 8133.6361487345. The cubic root of 66156037 is about 404.4422276582.

The spelling of 66156037 in words is "sixty-six million, one hundred fifty-six thousand, thirty-seven".