6401393477 has 4 divisors (see below), whose sum is σ = 6522174540. Its totient is φ = 6280612416.

The previous prime is 6401393461. The next prime is 6401393489. The reversal of 6401393477 is 7743931046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7743931046 = 2 ⋅3871965523.

It can be written as a sum of positive squares in 2 ways, for example, as 2593763041 + 3807630436 = 50929^2 + 61706^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401393477 - 2⁴ = 6401393461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401392477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60390452 + ... + 60390557.

It is an arithmetic number, because the mean of its divisors is an integer number (1630543635).

Almost surely, 2^6401393477 is an apocalyptic number.

It is an amenable number.

6401393477 is a deficient number, since it is larger than the sum of its proper divisors (120781063).

6401393477 is a wasteful number, since it uses less digits than its factorization.

6401393477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120781062.

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 6401393477 is about 80008.7087572347. The cubic root of 6401393477 is about 1856.7702725684.

The spelling of 6401393477 in words is "six billion, four hundred one million, three hundred ninety-three thousand, four hundred seventy-seven".