66037826531 has 4 divisors (see below), whose sum is σ = 67283823312. Its totient is φ = 64791829752.

The previous prime is 66037826513. The next prime is 66037826563. The reversal of 66037826531 is 13562873066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66037826531 - 2²² = 66033632227 is a prime.

It is a super-2 number, since 2×66037826531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66037826131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622998311 + ... + 622998416.

It is an arithmetic number, because the mean of its divisors is an integer number (16820955828).

Almost surely, 2^66037826531 is an apocalyptic number.

66037826531 is a deficient number, since it is larger than the sum of its proper divisors (1245996781).

66037826531 is a wasteful number, since it uses less digits than its factorization.

66037826531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245996780.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 66037826531 in words is "sixty-six billion, thirty-seven million, eight hundred twenty-six thousand, five hundred thirty-one".