52668155561 has 16 divisors (see below), whose sum is σ = 64269917184. Its totient is φ = 42177122064.

The previous prime is 52668155557. The next prime is 52668155567. The reversal of 52668155561 is 16555186625.

It is not a de Polignac number, because 52668155561 - 2² = 52668155557 is a prime.

It is a super-2 number, since 2×52668155561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52668155567) 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, 3796931 + ... + 3810776.

It is an arithmetic number, because the mean of its divisors is an integer number (4016869824).

Almost surely, 2^52668155561 is an apocalyptic number.

It is an amenable number.

52668155561 is a deficient number, since it is larger than the sum of its proper divisors (11601761623).

52668155561 is a wasteful number, since it uses less digits than its factorization.

52668155561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7607780.

The product of its digits is 2160000, while the sum is 50.

The spelling of 52668155561 in words is "fifty-two billion, six hundred sixty-eight million, one hundred fifty-five thousand, five hundred sixty-one".