2151165664623 has 16 divisors (see below), whose sum is σ = 2882782135296. Its totient is φ = 1426837405440.

The previous prime is 2151165664607. The next prime is 2151165664649. The reversal of 2151165664623 is 3264665611512.

It is a happy number.

It is not a de Polignac number, because 2151165664623 - 2⁴ = 2151165664607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151165663623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187888 + ... + 2082698.

It is an arithmetic number, because the mean of its divisors is an integer number (180173883456).

Almost surely, 2^{2151165664623} is an apocalyptic number.

2151165664623 is a deficient number, since it is larger than the sum of its proper divisors (731616470673).

2151165664623 is a wasteful number, since it uses less digits than its factorization.

2151165664623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896734.

The product of its digits is 1555200, while the sum is 48.

The spelling of 2151165664623 in words is "two trillion, one hundred fifty-one billion, one hundred sixty-five million, six hundred sixty-four thousand, six hundred twenty-three".