2051865974399 has 8 divisors (see below), whose sum is σ = 2160066986880. Its totient is φ = 1943685768600.

The previous prime is 2051865974383. The next prime is 2051865974441. The reversal of 2051865974399 is 9934795681502.

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 2051865974399 - 2⁴ = 2051865974383 is a prime.

It is a super-2 number, since 2×2051865974399² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051865974699) 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, 4999037 + ... + 5393894.

It is an arithmetic number, because the mean of its divisors is an integer number (270008373360).

It is a 1-persistent number, because it is pandigital, but 2⋅2051865974399 = 4103731948798 is not.

Almost surely, 2^{2051865974399} is an apocalyptic number.

2051865974399 is a deficient number, since it is larger than the sum of its proper divisors (108201012481).

2051865974399 is a wasteful number, since it uses less digits than its factorization.

2051865974399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10403341.

The product of its (nonzero) digits is 146966400, while the sum is 68.

The spelling of 2051865974399 in words is "two trillion, fifty-one billion, eight hundred sixty-five million, nine hundred seventy-four thousand, three hundred ninety-nine".