661246319 has 8 divisors (see below), whose sum is σ = 680218560. Its totient is φ = 642409600.

The previous prime is 661246259. The next prime is 661246349. The reversal of 661246319 is 913642166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661246319 - 2²⁰ = 660197743 is a prime.

It is a super-2 number, since 2×661246319² = 874493388782099522, 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 (661246349) 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, 23942 + ... + 43539.

It is an arithmetic number, because the mean of its divisors is an integer number (85027320).

Almost surely, 2^661246319 is an apocalyptic number.

661246319 is a deficient number, since it is larger than the sum of its proper divisors (18972241).

661246319 is a wasteful number, since it uses less digits than its factorization.

661246319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67761.

The product of its digits is 46656, while the sum is 38.

The square root of 661246319 is about 25714.7101675286. The cubic root of 661246319 is about 871.2064641930.

The spelling of 661246319 in words is "six hundred sixty-one million, two hundred forty-six thousand, three hundred nineteen".