340755728521 has 8 divisors (see below), whose sum is σ = 369305083784. Its totient is φ = 312540284160.

The previous prime is 340755728507. The next prime is 340755728527. The reversal of 340755728521 is 125827557043.

It can be written as a sum of positive squares in 4 ways, for example, as 7919042121 + 332836686400 = 88989^2 + 576920^2 .

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

It is not a de Polignac number, because 340755728521 - 2¹⁹ = 340755204233 is a prime.

It is a super-2 number, since 2×340755728521² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (340755728527) 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, 83475600 + ... + 83479681.

It is an arithmetic number, because the mean of its divisors is an integer number (46163135473).

Almost surely, 2^340755728521 is an apocalyptic number.

It is an amenable number.

340755728521 is a deficient number, since it is larger than the sum of its proper divisors (28549355263).

340755728521 is a wasteful number, since it uses less digits than its factorization.

340755728521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166955451.

The product of its (nonzero) digits is 2352000, while the sum is 49.

The spelling of 340755728521 in words is "three hundred forty billion, seven hundred fifty-five million, seven hundred twenty-eight thousand, five hundred twenty-one".