66256619293454 has 4 divisors (see below), whose sum is σ = 99384928940184. Its totient is φ = 33128309646726.

The previous prime is 66256619293453. The next prime is 66256619293477. The reversal of 66256619293454 is 45439291665266.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66256619293453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16564154823362 + ... + 16564154823365.

It is an arithmetic number, because the mean of its divisors is an integer number (24846232235046).

Almost surely, 2^{66256619293454} is an apocalyptic number.

66256619293454 is a deficient number, since it is larger than the sum of its proper divisors (33128309646730).

66256619293454 is a wasteful number, since it uses less digits than its factorization.

66256619293454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33128309646729.

The product of its digits is 503884800, while the sum is 68.

The spelling of 66256619293454 in words is "sixty-six trillion, two hundred fifty-six billion, six hundred nineteen million, two hundred ninety-three thousand, four hundred fifty-four".