63940400273 has 4 divisors (see below), whose sum is σ = 64096734180. Its totient is φ = 63784066368.

The previous prime is 63940400261. The next prime is 63940400287. The reversal of 63940400273 is 37200404936.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28125973264 + 35814427009 = 167708^2 + 189247^2 .

It is a cyclic number.

It is not a de Polignac number, because 63940400273 - 2²² = 63936205969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63940400203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78166340 + ... + 78167157.

It is an arithmetic number, because the mean of its divisors is an integer number (16024183545).

Almost surely, 2^63940400273 is an apocalyptic number.

It is an amenable number.

63940400273 is a deficient number, since it is larger than the sum of its proper divisors (156333907).

63940400273 is a wasteful number, since it uses less digits than its factorization.

63940400273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156333906.

The product of its (nonzero) digits is 108864, while the sum is 38.

The spelling of 63940400273 in words is "sixty-three billion, nine hundred forty million, four hundred thousand, two hundred seventy-three".