83747743721 has 16 divisors (see below), whose sum is σ = 88035735744. Its totient is φ = 79567354944.

The previous prime is 83747743679. The next prime is 83747743733. The reversal of 83747743721 is 12734774738.

It is a cyclic number.

It is not a de Polignac number, because 83747743721 - 2¹⁸ = 83747481577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83747743741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11128466 + ... + 11135988.

It is an arithmetic number, because the mean of its divisors is an integer number (5502233484).

Almost surely, 2^83747743721 is an apocalyptic number.

It is an amenable number.

83747743721 is a deficient number, since it is larger than the sum of its proper divisors (4287992023).

83747743721 is a wasteful number, since it uses less digits than its factorization.

83747743721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14600.

The product of its digits is 5531904, while the sum is 53.

The spelling of 83747743721 in words is "eighty-three billion, seven hundred forty-seven million, seven hundred forty-three thousand, seven hundred twenty-one".