66554462261 has 16 divisors (see below), whose sum is σ = 77242788480. Its totient is φ = 56162272320.

The previous prime is 66554462257. The next prime is 66554462291. The reversal of 66554462261 is 16226445566.

It is not a de Polignac number, because 66554462261 - 2² = 66554462257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554462231) 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, 775775 + ... + 857283.

It is an arithmetic number, because the mean of its divisors is an integer number (4827674280).

Almost surely, 2^66554462261 is an apocalyptic number.

It is an amenable number.

66554462261 is a deficient number, since it is larger than the sum of its proper divisors (10688326219).

66554462261 is a wasteful number, since it uses less digits than its factorization.

66554462261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83324.

The product of its digits is 2073600, while the sum is 47.

The spelling of 66554462261 in words is "sixty-six billion, five hundred fifty-four million, four hundred sixty-two thousand, two hundred sixty-one".