61668512240 has 40 divisors (see below), whose sum is σ = 143459858160. Its totient is φ = 24653543936.

The previous prime is 61668512207. The next prime is 61668512273. The reversal of 61668512240 is 4221586616.

It is an interprime number because it is at equal distance from previous prime (61668512207) and next prime (61668512273).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72725 + ... + 358644.

It is an arithmetic number, because the mean of its divisors is an integer number (3586496454).

Almost surely, 2^61668512240 is an apocalyptic number.

It is an amenable number.

61668512240 is an abundant number, since it is smaller than the sum of its proper divisors (81791345920).

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

61668512240 is a wasteful number, since it uses less digits than its factorization.

61668512240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433169 (or 433163 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 61668512240 in words is "sixty-one billion, six hundred sixty-eight million, five hundred twelve thousand, two hundred forty".