66554051293 has 4 divisors (see below), whose sum is σ = 66555754780. Its totient is φ = 66552347808.

The previous prime is 66554051279. The next prime is 66554051329. The reversal of 66554051293 is 39215045566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64616114809 + 1937936484 = 254197^2 + 44022^2 .

It is a cyclic number.

It is not a de Polignac number, because 66554051293 - 2⁵ = 66554051261 is a prime.

It is a super-2 number, since 2×66554051293² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554051203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791730 + ... + 871747.

It is an arithmetic number, because the mean of its divisors is an integer number (16638938695).

Almost surely, 2^66554051293 is an apocalyptic number.

It is an amenable number.

66554051293 is a deficient number, since it is larger than the sum of its proper divisors (1703487).

66554051293 is a wasteful number, since it uses less digits than its factorization.

66554051293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703486.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 66554051293 in words is "sixty-six billion, five hundred fifty-four million, fifty-one thousand, two hundred ninety-three".