63685437007 has 4 divisors (see below), whose sum is σ = 64887049080. Its totient is φ = 62483824936.

The previous prime is 63685436993. The next prime is 63685437017. The reversal of 63685437007 is 70073458636.

It is a happy number.

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 63685437007 - 2²⁷ = 63551219279 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 (63685437017) 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, 600805957 + ... + 600806062.

It is an arithmetic number, because the mean of its divisors is an integer number (16221762270).

Almost surely, 2^63685437007 is an apocalyptic number.

63685437007 is a deficient number, since it is larger than the sum of its proper divisors (1201612073).

63685437007 is a wasteful number, since it uses less digits than its factorization.

63685437007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201612072.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 63685437007 in words is "sixty-three billion, six hundred eighty-five million, four hundred thirty-seven thousand, seven".