1986497277265 has 4 divisors (see below), whose sum is σ = 2383796732724. Its totient is φ = 1589197821808.

The previous prime is 1986497277241. The next prime is 1986497277287. The reversal of 1986497277265 is 5627727946891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1344043730241 + 642453547024 = 1159329^2 + 801532^2 .

It is a cyclic number.

It is not a de Polignac number, because 1986497277265 - 2¹⁵ = 1986497244497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198649727722 + ... + 198649727731.

It is an arithmetic number, because the mean of its divisors is an integer number (595949183181).

Almost surely, 2^{1986497277265} is an apocalyptic number.

It is an amenable number.

1986497277265 is a deficient number, since it is larger than the sum of its proper divisors (397299455459).

1986497277265 is an equidigital number, since it uses as much as digits as its factorization.

1986497277265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397299455458.

The product of its digits is 640120320, while the sum is 73.

The spelling of 1986497277265 in words is "one trillion, nine hundred eighty-six billion, four hundred ninety-seven million, two hundred seventy-seven thousand, two hundred sixty-five".