66025150101561 has 24 divisors (see below), whose sum is σ = 102525018672384. Its totient is φ = 37684939101600.

The previous prime is 66025150101451. The next prime is 66025150101569. The reversal of 66025150101561 is 16510105152066.

66025150101561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66025150101561 - 2²⁷ = 66025015883833 is a prime.

It is a super-2 number, since 2×66025150101561² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66025150101569) 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 23 ways as a sum of consecutive naturals, for example, 260099490 + ... + 260353211.

It is an arithmetic number, because the mean of its divisors is an integer number (4271875778016).

Almost surely, 2^{66025150101561} is an apocalyptic number.

It is an amenable number.

66025150101561 is a deficient number, since it is larger than the sum of its proper divisors (36499868570823).

66025150101561 is a wasteful number, since it uses less digits than its factorization.

66025150101561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520453581 (or 520453574 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 66025150101561 in words is "sixty-six trillion, twenty-five billion, one hundred fifty million, one hundred one thousand, five hundred sixty-one".