83121611237767 has 4 divisors (see below), whose sum is σ = 87496432881880. Its totient is φ = 78746789593656.

The previous prime is 83121611237759. The next prime is 83121611237813. The reversal of 83121611237767 is 76773211612138.

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 83121611237767 - 2³ = 83121611237759 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 (83121611237867) 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, 2187410822028 + ... + 2187410822065.

It is an arithmetic number, because the mean of its divisors is an integer number (21874108220470).

Almost surely, 2^{83121611237767} is an apocalyptic number.

83121611237767 is a deficient number, since it is larger than the sum of its proper divisors (4374821644113).

83121611237767 is a wasteful number, since it uses less digits than its factorization.

83121611237767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374821644112.

The product of its digits is 3556224, while the sum is 55.

The spelling of 83121611237767 in words is "eighty-three trillion, one hundred twenty-one billion, six hundred eleven million, two hundred thirty-seven thousand, seven hundred sixty-seven".