18961670647 has 8 divisors (see below), whose sum is σ = 20504235456. Its totient is φ = 17466569472.

The previous prime is 18961670639. The next prime is 18961670653. The reversal of 18961670647 is 74607616981.

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 18961670647 - 2³ = 18961670639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18961670617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11865078 + ... + 11866675.

It is an arithmetic number, because the mean of its divisors is an integer number (2563029432).

Almost surely, 2^18961670647 is an apocalyptic number.

18961670647 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18961670647 is a deficient number, since it is larger than the sum of its proper divisors (1542564809).

18961670647 is a wasteful number, since it uses less digits than its factorization.

18961670647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23731817.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 18961670647 in words is "eighteen billion, nine hundred sixty-one million, six hundred seventy thousand, six hundred forty-seven".