66431541 has 32 divisors (see below), whose sum is σ = 98942976. Its totient is φ = 39639600.

The previous prime is 66431531. The next prime is 66431549. The reversal of 66431541 is 14513466.

It is not a de Polignac number, because 66431541 - 2¹³ = 66423349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66431499 and 66431508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66431549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 507046 + ... + 507176.

It is an arithmetic number, because the mean of its divisors is an integer number (3091968).

Almost surely, 2^66431541 is an apocalyptic number.

It is an amenable number.

66431541 is a deficient number, since it is larger than the sum of its proper divisors (32511435).

66431541 is a wasteful number, since it uses less digits than its factorization.

66431541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 272 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 66431541 is about 8150.5546437037. The cubic root of 66431541 is about 405.0028775897.

The spelling of 66431541 in words is "sixty-six million, four hundred thirty-one thousand, five hundred forty-one".