642154495 has 16 divisors (see below), whose sum is σ = 811952640. Its totient is φ = 486199584.

The previous prime is 642154489. The next prime is 642154507. The reversal of 642154495 is 594451246.

It is a cyclic number.

It is not a de Polignac number, because 642154495 - 2⁵ = 642154463 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113422 + ... + 118948.

It is an arithmetic number, because the mean of its divisors is an integer number (50747040).

Almost surely, 2^642154495 is an apocalyptic number.

642154495 is a deficient number, since it is larger than the sum of its proper divisors (169798145).

642154495 is a wasteful number, since it uses less digits than its factorization.

642154495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6774.

The product of its digits is 172800, while the sum is 40.

The square root of 642154495 is about 25340.7674508883. The cubic root of 642154495 is about 862.7398176507.

The spelling of 642154495 in words is "six hundred forty-two million, one hundred fifty-four thousand, four hundred ninety-five".