66771495 has 96 divisors (see below), whose sum is σ = 144263808. Its totient is φ = 27869184.

The previous prime is 66771473. The next prime is 66771521. The reversal of 66771495 is 59417766.

It is a happy number.

It is not a de Polignac number, because 66771495 - 2⁶ = 66771431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66771495.

It is a congruent number.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 197967 + ... + 198303.

It is an arithmetic number, because the mean of its divisors is an integer number (1502748).

Almost surely, 2^66771495 is an apocalyptic number.

66771495 is an abundant number, since it is smaller than the sum of its proper divisors (77492313).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66771495 is a wasteful number, since it uses less digits than its factorization.

66771495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409 (or 406 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 66771495 is about 8171.3826859351. The cubic root of 66771495 is about 405.6925507728.

The spelling of 66771495 in words is "sixty-six million, seven hundred seventy-one thousand, four hundred ninety-five".