68516403747 has 32 divisors (see below), whose sum is σ = 111076427520. Its totient is φ = 37025464320.

The previous prime is 68516403743. The next prime is 68516403793. The reversal of 68516403747 is 74730461586.

It is a happy number.

It is not a de Polignac number, because 68516403747 - 2² = 68516403743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 68516403747.

It is not an unprimeable number, because it can be changed into a prime (68516403743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3203358 + ... + 3224675.

It is an arithmetic number, because the mean of its divisors is an integer number (3471138360).

Almost surely, 2^68516403747 is an apocalyptic number.

68516403747 is a deficient number, since it is larger than the sum of its proper divisors (42560023773).

68516403747 is a wasteful number, since it uses less digits than its factorization.

68516403747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6428083.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 68516403747 in words is "sixty-eight billion, five hundred sixteen million, four hundred three thousand, seven hundred forty-seven".