15515455564066 has 8 divisors (see below), whose sum is σ = 23534679788460. Its totient is φ = 7670562301248.

The previous prime is 15515455564031. The next prime is 15515455564093. The reversal of 15515455564066 is 66046555451551.

15515455564066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13655027763441 + 1860427800625 = 3695271^2 + 1363975^2 .

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

It is a super-2 number, since 2×15515455564066² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15515455564066.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43582740171 + ... + 43582740526.

Almost surely, 2^{15515455564066} is an apocalyptic number.

15515455564066 is a deficient number, since it is larger than the sum of its proper divisors (8019224224394).

15515455564066 is an equidigital number, since it uses as much as digits as its factorization.

15515455564066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87165480788.

The product of its (nonzero) digits is 54000000, while the sum is 58.

The spelling of 15515455564066 in words is "fifteen trillion, five hundred fifteen billion, four hundred fifty-five million, five hundred sixty-four thousand, sixty-six".