2051154665465 has 4 divisors (see below), whose sum is σ = 2461385598564. Its totient is φ = 1640923732368.

The previous prime is 2051154665449. The next prime is 2051154665491. The reversal of 2051154665465 is 5645664511502.

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 1067971364329 + 983183301136 = 1033427^2 + 991556^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051154665465 - 2⁴ = 2051154665449 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, 205115466542 + ... + 205115466551.

It is an arithmetic number, because the mean of its divisors is an integer number (615346399641).

Almost surely, 2^{2051154665465} is an apocalyptic number.

It is an amenable number.

2051154665465 is a deficient number, since it is larger than the sum of its proper divisors (410230933099).

2051154665465 is an equidigital number, since it uses as much as digits as its factorization.

2051154665465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410230933098.

The product of its (nonzero) digits is 4320000, while the sum is 50.

The spelling of 2051154665465 in words is "two trillion, fifty-one billion, one hundred fifty-four million, six hundred sixty-five thousand, four hundred sixty-five".