340454145521 has 16 divisors (see below), whose sum is σ = 401662660608. Its totient is φ = 282389662800.

The previous prime is 340454145511. The next prime is 340454145533. The reversal of 340454145521 is 125541454043.

It is not a de Polignac number, because 340454145521 - 2²⁶ = 340387036657 is a prime.

It is a super-2 number, since 2×340454145521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340454145511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6686666 + ... + 6737388.

It is an arithmetic number, because the mean of its divisors is an integer number (25103916288).

Almost surely, 2^340454145521 is an apocalyptic number.

340454145521 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

340454145521 is a deficient number, since it is larger than the sum of its proper divisors (61208515087).

340454145521 is a wasteful number, since it uses less digits than its factorization.

340454145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81692.

The product of its (nonzero) digits is 192000, while the sum is 38.

Adding to 340454145521 its reverse (125541454043), we get a palindrome (465995599564).

The spelling of 340454145521 in words is "three hundred forty billion, four hundred fifty-four million, one hundred forty-five thousand, five hundred twenty-one".