1987612166077 has 8 divisors (see below), whose sum is σ = 2007321104952. Its totient is φ = 1967903808000.

The previous prime is 1987612166069. The next prime is 1987612166093. The reversal of 1987612166077 is 7706612167891.

It can be written as a sum of positive squares in 4 ways, for example, as 92457956761 + 1895154209316 = 304069^2 + 1376646^2 .

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 1987612166077 - 2³ = 1987612166069 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 (1987612166677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10804773 + ... + 10987189.

It is an arithmetic number, because the mean of its divisors is an integer number (250915138119).

Almost surely, 2^{1987612166077} is an apocalyptic number.

It is an amenable number.

1987612166077 is a deficient number, since it is larger than the sum of its proper divisors (19708938875).

1987612166077 is a wasteful number, since it uses less digits than its factorization.

1987612166077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290399.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The spelling of 1987612166077 in words is "one trillion, nine hundred eighty-seven billion, six hundred twelve million, one hundred sixty-six thousand, seventy-seven".