66731495 has 4 divisors (see below), whose sum is σ = 80077800. Its totient is φ = 53385192.

The previous prime is 66731491. The next prime is 66731503. The reversal of 66731495 is 59413766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59413766 = 2 ⋅29706883.

It is a cyclic number.

It is not a de Polignac number, because 66731495 - 2² = 66731491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66731491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6673145 + ... + 6673154.

It is an arithmetic number, because the mean of its divisors is an integer number (20019450).

Almost surely, 2^66731495 is an apocalyptic number.

66731495 is a deficient number, since it is larger than the sum of its proper divisors (13346305).

66731495 is a wasteful number, since it uses less digits than its factorization.

66731495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13346304.

The product of its digits is 136080, while the sum is 41.

The square root of 66731495 is about 8168.9347530752. The cubic root of 66731495 is about 405.6115234644.

The spelling of 66731495 in words is "sixty-six million, seven hundred thirty-one thousand, four hundred ninety-five".