66554162725 has 24 divisors (see below), whose sum is σ = 85335038208. Its totient is φ = 51437673600.

The previous prime is 66554162723. The next prime is 66554162737. The reversal of 66554162725 is 52726145566.

It is not a de Polignac number, because 66554162725 - 2¹ = 66554162723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554162723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 381777 + ... + 528073.

It is an arithmetic number, because the mean of its divisors is an integer number (3555626592).

Almost surely, 2^66554162725 is an apocalyptic number.

It is an amenable number.

66554162725 is a deficient number, since it is larger than the sum of its proper divisors (18780875483).

66554162725 is a wasteful number, since it uses less digits than its factorization.

66554162725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146925 (or 146920 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 49.

The spelling of 66554162725 in words is "sixty-six billion, five hundred fifty-four million, one hundred sixty-two thousand, seven hundred twenty-five".