6400261499 has 4 divisors (see below), whose sum is σ = 6556365480. Its totient is φ = 6244157520.

The previous prime is 6400261493. The next prime is 6400261501. The reversal of 6400261499 is 9941620046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9941620046 = 2 ⋅4970810023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6400261499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 156103939 = 6400261499 / (6 + 4 + 0 + 0 + 2 + 6 + 1 + 4 + 9 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6400261493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78051929 + ... + 78052010.

It is an arithmetic number, because the mean of its divisors is an integer number (1639091370).

Almost surely, 2^6400261499 is an apocalyptic number.

6400261499 is a deficient number, since it is larger than the sum of its proper divisors (156103981).

6400261499 is a wasteful number, since it uses less digits than its factorization.

6400261499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156103980.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 6400261499 is about 80001.6343520556. The cubic root of 6400261499 is about 1856.6608199932.

The spelling of 6400261499 in words is "six billion, four hundred million, two hundred sixty-one thousand, four hundred ninety-nine".