1865966958997 has 4 divisors (see below), whose sum is σ = 1879587155916. Its totient is φ = 1852346762080.

The previous prime is 1865966958983. The next prime is 1865966959007. The reversal of 1865966958997 is 7998596695681.

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 718681758001 + 1147285200996 = 847751^2 + 1071114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865966958997 - 2²³ = 1865958570389 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 (1865966950997) 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, 6810098254 + ... + 6810098527.

It is an arithmetic number, because the mean of its divisors is an integer number (469896788979).

Almost surely, 2^{1865966958997} is an apocalyptic number.

It is an amenable number.

1865966958997 is a deficient number, since it is larger than the sum of its proper divisors (13620196919).

1865966958997 is a wasteful number, since it uses less digits than its factorization.

1865966958997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13620196918.

The product of its digits is 15872371200, while the sum is 88.

The spelling of 1865966958997 in words is "one trillion, eight hundred sixty-five billion, nine hundred sixty-six million, nine hundred fifty-eight thousand, nine hundred ninety-seven".