661846269 has 16 divisors (see below), whose sum is σ = 1035786368. Its totient is φ = 367975872.

The previous prime is 661846267. The next prime is 661846271. The reversal of 661846269 is 962648166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (661846267) and next prime (661846271).

It is not a de Polignac number, because 661846269 - 2¹ = 661846267 is a prime.

It is a super-2 number, since 2×661846269² = 876080967578440722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661846267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425122 + ... + 426675.

It is an arithmetic number, because the mean of its divisors is an integer number (64736648).

Almost surely, 2^661846269 is an apocalyptic number.

It is an amenable number.

661846269 is a deficient number, since it is larger than the sum of its proper divisors (373940099).

661846269 is a wasteful number, since it uses less digits than its factorization.

661846269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851844.

The product of its digits is 746496, while the sum is 48.

The square root of 661846269 is about 25726.3730245832. The cubic root of 661846269 is about 871.4698669557.

The spelling of 661846269 in words is "six hundred sixty-one million, eight hundred forty-six thousand, two hundred sixty-nine".