309551242040 has 32 divisors (see below), whose sum is σ = 720507204000. Its totient is φ = 119550824064.

The previous prime is 309551242009. The next prime is 309551242057. The reversal of 309551242040 is 40242155903.

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, 133426100 + ... + 133428419.

It is an arithmetic number, because the mean of its divisors is an integer number (22515850125).

Almost surely, 2^309551242040 is an apocalyptic number.

It is an amenable number.

309551242040 is an abundant number, since it is smaller than the sum of its proper divisors (410955961960).

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

309551242040 is a wasteful number, since it uses less digits than its factorization.

309551242040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266854559 (or 266854555 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 309551242040 its reverse (40242155903), we get a palindrome (349793397943).

The spelling of 309551242040 in words is "three hundred nine billion, five hundred fifty-one million, two hundred forty-two thousand, forty".