206420351515 has 16 divisors (see below), whose sum is σ = 288868132800. Its totient is φ = 141545382720.

The previous prime is 206420351507. The next prime is 206420351519. The reversal of 206420351515 is 515153024602.

It is not a de Polignac number, because 206420351515 - 2³ = 206420351507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206420351519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60179146 + ... + 60182575.

It is an arithmetic number, because the mean of its divisors is an integer number (18054258300).

Almost surely, 2^206420351515 is an apocalyptic number.

206420351515 is a deficient number, since it is larger than the sum of its proper divisors (82447781285).

206420351515 is an equidigital number, since it uses as much as digits as its factorization.

206420351515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120361747 (or 120361733 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 206420351515 in words is "two hundred six billion, four hundred twenty million, three hundred fifty-one thousand, five hundred fifteen".