66477771953 has 8 divisors (see below), whose sum is σ = 69449073408. Its totient is φ = 63513217504.

The previous prime is 66477771947. The next prime is 66477771959. The reversal of 66477771953 is 35917777466.

It is an interprime number because it is at equal distance from previous prime (66477771947) and next prime (66477771959).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66477771953 - 2¹⁰ = 66477770929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66477771959) 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 in 7 ways as a sum of consecutive naturals, for example, 1666601 + ... + 1706022.

It is an arithmetic number, because the mean of its divisors is an integer number (8681134176).

Almost surely, 2^66477771953 is an apocalyptic number.

It is an amenable number.

66477771953 is a deficient number, since it is larger than the sum of its proper divisors (2971301455).

66477771953 is a wasteful number, since it uses less digits than its factorization.

66477771953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373503.

The product of its digits is 46675440, while the sum is 62.

The spelling of 66477771953 in words is "sixty-six billion, four hundred seventy-seven million, seven hundred seventy-one thousand, nine hundred fifty-three".