18947620077 has 16 divisors (see below), whose sum is σ = 25703016000. Its totient is φ = 12412174464.

The previous prime is 18947620073. The next prime is 18947620121. The reversal of 18947620077 is 77002674981.

It is not a de Polignac number, because 18947620077 - 2² = 18947620073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947620073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400449 + ... + 445257.

It is an arithmetic number, because the mean of its divisors is an integer number (1606438500).

Almost surely, 2^18947620077 is an apocalyptic number.

It is an amenable number.

18947620077 is a deficient number, since it is larger than the sum of its proper divisors (6755395923).

18947620077 is a wasteful number, since it uses less digits than its factorization.

18947620077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47260.

The product of its (nonzero) digits is 1185408, while the sum is 51.

The spelling of 18947620077 in words is "eighteen billion, nine hundred forty-seven million, six hundred twenty thousand, seventy-seven".