1640951495 has 4 divisors (see below), whose sum is σ = 1969141800. Its totient is φ = 1312761192.

The previous prime is 1640951461. The next prime is 1640951563. The reversal of 1640951495 is 5941590461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1640951495 - 2⁸ = 1640951239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164095145 + ... + 164095154.

It is an arithmetic number, because the mean of its divisors is an integer number (492285450).

Almost surely, 2^1640951495 is an apocalyptic number.

1640951495 is a deficient number, since it is larger than the sum of its proper divisors (328190305).

1640951495 is an equidigital number, since it uses as much as digits as its factorization.

1640951495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328190304.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1640951495 is about 40508.6595063327. The cubic root of 1640951495 is about 1179.5017275277.

The spelling of 1640951495 in words is "one billion, six hundred forty million, nine hundred fifty-one thousand, four hundred ninety-five".