66791536 has 40 divisors (see below), whose sum is σ = 155684480. Its totient is φ = 27117504.

The previous prime is 66791531. The next prime is 66791537. The reversal of 66791536 is 63519766.

It is a super-2 number, since 2×66791536² = 8922218562478592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66791492 and 66791501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66791531) 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, 13566 + ... + 17821.

It is an arithmetic number, because the mean of its divisors is an integer number (3892112).

Almost surely, 2^66791536 is an apocalyptic number.

It is an amenable number.

66791536 is an abundant number, since it is smaller than the sum of its proper divisors (88892944).

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

66791536 is a wasteful number, since it uses less digits than its factorization.

66791536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31421 (or 31415 counting only the distinct ones).

The product of its digits is 204120, while the sum is 43.

The square root of 66791536 is about 8172.6088857843. The cubic root of 66791536 is about 405.7331353122.

The spelling of 66791536 in words is "sixty-six million, seven hundred ninety-one thousand, five hundred thirty-six".