6661246437 has 32 divisors (see below), whose sum is σ = 10231228800. Its totient is φ = 4278282624.

The previous prime is 6661246433. The next prime is 6661246441. The reversal of 6661246437 is 7346421666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6661246433) and next prime (6661246441).

It is not a de Polignac number, because 6661246437 - 2² = 6661246433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6661246392 and 6661246401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661246433) 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, 356553 + ... + 374769.

It is an arithmetic number, because the mean of its divisors is an integer number (319725900).

Almost surely, 2^6661246437 is an apocalyptic number.

It is an amenable number.

6661246437 is a deficient number, since it is larger than the sum of its proper divisors (3569982363).

6661246437 is a wasteful number, since it uses less digits than its factorization.

6661246437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18722 (or 18716 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The square root of 6661246437 is about 81616.4593510402. The cubic root of 6661246437 is about 1881.5618563265.

The spelling of 6661246437 in words is "six billion, six hundred sixty-one million, two hundred forty-six thousand, four hundred thirty-seven".