661631414 has 12 divisors (see below), whose sum is σ = 1047431484. Its totient is φ = 313404012.

The previous prime is 661631413. The next prime is 661631431. The reversal of 661631414 is 414136166.

It is a super-2 number, since 2×661631414² = 875512255983278792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661631413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 457472 + ... + 458915.

It is an arithmetic number, because the mean of its divisors is an integer number (87285957).

Almost surely, 2^661631414 is an apocalyptic number.

661631414 is a deficient number, since it is larger than the sum of its proper divisors (385800070).

661631414 is a wasteful number, since it uses less digits than its factorization.

661631414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916427 (or 916408 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 661631414 is about 25722.1969123946. The cubic root of 661631414 is about 871.3755550629.

The spelling of 661631414 in words is "six hundred sixty-one million, six hundred thirty-one thousand, four hundred fourteen".