66100340 has 12 divisors (see below), whose sum is σ = 138810756. Its totient is φ = 26440128.

The previous prime is 66100319. The next prime is 66100343. The reversal of 66100340 is 4300166.

It can be written as a sum of positive squares in 2 ways, for example, as 36048016 + 30052324 = 6004^2 + 5482^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 3305017 = 66100340 / (6 + 6 + 1 + 0 + 0 + 3 + 4 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66100343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652489 + ... + 1652528.

It is an arithmetic number, because the mean of its divisors is an integer number (11567563).

Almost surely, 2^66100340 is an apocalyptic number.

It is an amenable number.

66100340 is an abundant number, since it is smaller than the sum of its proper divisors (72710416).

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

66100340 is a wasteful number, since it uses less digits than its factorization.

66100340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305026 (or 3305024 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 66100340 is about 8130.2115593630. The cubic root of 66100340 is about 404.3286953469.

The spelling of 66100340 in words is "sixty-six million, one hundred thousand, three hundred forty".