66557461311 has 48 divisors (see below), whose sum is σ = 114630018048. Its totient is φ = 36740332800.

The previous prime is 66557461309. The next prime is 66557461337. The reversal of 66557461311 is 11316475566.

66557461311 is a `hidden beast` number, since 6 + 6 + 5 + 574 + 61 + 3 + 11 = 666.

It is not a de Polignac number, because 66557461311 - 2¹ = 66557461309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66557461381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 585681 + ... + 690026.

It is an arithmetic number, because the mean of its divisors is an integer number (2388125376).

Almost surely, 2^66557461311 is an apocalyptic number.

66557461311 is a deficient number, since it is larger than the sum of its proper divisors (48072556737).

66557461311 is a wasteful number, since it uses less digits than its factorization.

66557461311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275772 (or 1275769 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The spelling of 66557461311 in words is "sixty-six billion, five hundred fifty-seven million, four hundred sixty-one thousand, three hundred eleven".