1966277256463 has 4 divisors (see below), whose sum is σ = 2117529353128. Its totient is φ = 1815025159800.

The previous prime is 1966277256457. The next prime is 1966277256467. The reversal of 1966277256463 is 3646527726691.

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

It is a cyclic number.

It is not a de Polignac number, because 1966277256463 - 2³³ = 1957687321871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1966277256395 and 1966277256404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966277256467) 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, 75626048313 + ... + 75626048338.

It is an arithmetic number, because the mean of its divisors is an integer number (529382338282).

Almost surely, 2^{1966277256463} is an apocalyptic number.

1966277256463 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1966277256463 is a deficient number, since it is larger than the sum of its proper divisors (151252096665).

1966277256463 is a wasteful number, since it uses less digits than its factorization.

1966277256463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151252096664.

The product of its digits is 137168640, while the sum is 64.

The spelling of 1966277256463 in words is "one trillion, nine hundred sixty-six billion, two hundred seventy-seven million, two hundred fifty-six thousand, four hundred sixty-three".